more DCE

src/include/Makefile.am

@@ -2,10 +2,5 @@
 SUBDIRS = .
 
 include_HEADERS = microhttpd.h
-noinst_HEADERS = microhttpd2.h microhttpd_tls.h
-
-if HAVE_EXPERIMENTAL
-include_HEADERS += microhttpd_ws.h
-endif
 
 EXTRA_DIST = platform.h autoinit_funcs.h mhd_options.h

src/include/microhttpd2.h

@@ -1,4340 +0,0 @@
-/*
-     This file is part of libmicrohttpd
-     Copyright (C) 2006-2018 Christian Grothoff, Karlson2k (Evgeny Grin)
-     (and other contributing authors)
-
-     This library is free software; you can redistribute it and/or
-     modify it under the terms of the GNU Lesser General Public
-     License as published by the Free Software Foundation; either
-     version 2.1 of the License, or (at your option) any later version.
-
-     This library is distributed in the hope that it will be useful,
-     but WITHOUT ANY WARRANTY; without even the implied warranty of
-     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
-     Lesser General Public License for more details.
-
-     You should have received a copy of the GNU Lesser General Public
-     License along with this library; if not, write to the Free Software
-     Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
-*/
-
-/**
- * Just includes the NEW definitions for the NG-API.
- * Note that we do not indicate which of the OLD APIs
- * simply need to be kept vs. deprecated.
- *
- *
- * The goal is to provide a basis for discussion!
- * Little of this is implemented yet.
- *
- * Main goals:
- * - simplify application callbacks by splitting header/upload/post
- *   functionality currently provided by calling the same
- *   MHD_AccessHandlerCallback 3+ times into separate callbacks.
- * - keep the API very simple for simple requests, but allow
- *   more complex logic to be incrementally introduced
- *   (via new struct MHD_Action construction)
- * - avoid repeated scans for URL matches via the new
- *   struct MHD_Action construction
- * - provide default logarithmic implementation of URL scan
- *   => reduce strcmp(url) from >= 3n operations to "log n"
- *      per request.
- * - better types, in particular avoid varargs for options
- * - make it harder to pass inconsistent options
- * - combine options and flags into more uniform API (at least
- *   exterally!)
- * - simplify API use by using sane defaults (benefiting from
- *   breaking backwards compatibility) and making all options
- *   really optional, and where applicable avoid having options
- *   where the default works if nothing is specified
- * - simplify API by moving rarely used http_version into
- *   MHD_request_get_information()
- * - avoid 'int' for MHD_YES/MHD_NO by introducing `enum MHD_Bool`
- * - improve terminology by eliminating confusion between
- *   'request' and 'connection'
- * - prepare API for having multiple TLS backends
- * - use more consistent prefixes for related functions
- *   by using MHD_subject_verb_object naming convention, also
- *   at the same time avoid symbol conflict with legacy names
- *   (so we can have one binary implementing old and new
- *   library API at the same time via compatibility layer).
- * - make it impossible to queue a response at the wrong time
- * - make it impossible to suspend a connection/request at the
- *   wrong time (improves thread-safety)
- * - make it clear which response status codes are "properly"
- *   supported (include the descriptive string) by using an enum;
- * - simplify API for common-case of one-shot responses by
- *   eliminating need for destroy response in most cases;
- *
- * NEW-EG:
- * - avoid fixed types, like uint32_t. They may not exist on some
- *   platforms. Instead use uint_fast32_t.
- *   It is also better for future-proof.
- * - check portability for embedded platforms. Some of them support
- *   64 bits, but 'int' could be just 16 bits resulting of silently
- *   dropping enum values higher than 65535.
- *   => in general, more functions, fewer enums for setup
- *
- * - Avoid returning pointers to internal members. It is not thread-safe and
- * even in single thread the value could change over the time. Prefer pointers to
- * app-allocated memory with the size, like MHD_daemon_get_static_info(enum
- * MHD_enum_name info_type, void *buf, size_t buf_size).
- *   => Except in cases where zero-copy matters.
- *
- * - Use separate app calls/functions for data the will not change for the
- * lifetime of the object and dynamic data. The only difference should be the
- * name. Like MHD_daemon_get_static_info(enum MHD_enum_name info_type, void *buf,
- * size_t buf_size) MHD_daemon_get_dynamic_info(enum MHD_enum_name info_type,
- * void *buf, size_t buf_size) Examples of static data: listen socket, number of
- * workers, daemon flags.  Examples of dynamic data: number of connections,
- * quiesce status.  It should give a clear idea whether the data could be changed
- * over the time (could be not obvious for some data) and thus may change the
- * approach how to use the data in app.  The same for: library, daemon,
- * connection, request. Not sure that dynamic data makes sense for the library.
- *
- * - Use clear separation between connection and request. Do not mix the kind
- * data in the callbacks.  Currently we are mixing things in
- * MHD_AccessHandlerCallback and MHD_RequestCompletedCallback. Instead of
- * pointers to struct MHD_Connection we should use pointers to (new) struct
- * MHD_Request.  Probably some other functions are mixing the things as well, to
- * be re-checked.
- *
- * - Define default response code in response object. There are a very little
- * chance that response body designed for 404 or 403 codes will be used with
- * 200 code. However, the responses body for 307 and 308 could be the same. So:
- * * add default response code in response object. Use zero for default 200.
- * * When app sending the response use zero for response's default code or
- *   use specific code to override response's default value.
- *
- * - Make responses unmodifiable after first use. It is not thread-safe.
- *   MHD-generated headers (Date, Connection/Keep-Alive) are again
- *   part of the *request* and do not count as part of the "response" here.
- *
- * - Remove "footers" from responses. With unmodifiable responses everything should be "headers".
- *   Add footers to *requests* instead.
- *
- * - Add API for adding request-specific response headers and footers. To
- * simplify the things it should just copy the strings (to avoid dealing with
- * complicated deinit of possible dynamic strings).  After this change it should
- * be possible to simplify DAuth handling as response could be reused (currently
- * 403 responses are modified for each reply).
- *
- * - Control response behaviour mainly by response flags, not by additional
- * headers (like MHD_RF_FORCE_CLOSE instead of "Connection: close").
- * It is easier for both: app and MHD.
- *
- * - Move response codes from MHD_HTTP_xxx namespace to MHD_HTTP_CODE_xxx
- *   namespace. It already may clash with other HTTP values.
- *
- * - plus other things that was discussed already, like avoiding extra calls
- *   for body-less requests. I assume it should be resolved with fundamental
- *   re-design of request/response cycle handling.
- *
- * - Internals: carefully check where locking is really required. Probably
- *   separate locks. Check out-of-thread value reading. Currently code assumes
- *   atomic reading of values used in other threads, which mostly true on x86,
- *   but not OK on other arches. Probably use read/write locking to minimize
- *   the threads interference.
- *
- * - figure out how to do portable variant of cork/uncork
- *
- * NEW-CG:
- * - Postprocessor is unusable night-mare when doing "stream processing"
- *   for tiny values where the application basically has to copy together
- *   the stream back into a single compact heap value, just making the
- *   parsing highly more complicated (see examples in Challenger)
- *
- * - non-stream processing variant for request bodies, give apps a
- *   way to request the full body in one buffer; give apps a way
- *   to request a 'large new allocation' for such buffers; give apps
- *   a way to specify a global quota for large allocations to ensure
- *   memory usage has a hard bound
- *
- * - remove request data from memory pool when response is queued
- *   (IF no callbacks and thus data cannot be used anymore, or IF
- *    application permits explictly per daemon) to get more space
- *   for building response;
- *
- *
- * TODO:
- * - varargs in upgrade is still there and ugly (and not even used!)
- * - migrate event loop apis (get fdset, timeout, MHD_run(), etc.)
- */
-#ifndef MICROHTTPD2_H
-#define MICROHTTPD2_H
-
-
-#ifdef __cplusplus
-extern "C"
-{
-#if 0                           /* keep Emacsens' auto-indent happy */
-}
-#endif
-#endif
-
-/* While we generally would like users to use a configure-driven
-   build process which detects which headers are present and
-   hence works on any platform, we use "standard" includes here
-   to build out-of-the-box for beginning users on common systems.
-
-   If generic headers don't work on your platform, include headers
-   which define 'va_list', 'size_t', 'ssize_t', 'intptr_t',
-   'uint16_t', 'uint32_t', 'uint64_t', 'off_t', 'struct sockaddr',
-   'socklen_t', 'fd_set' and "#define MHD_PLATFORM_H" before
-   including "microhttpd.h". Then the following "standard"
-   includes won't be used (which might be a good idea, especially
-   on platforms where they do not exist).
-   */
-#ifndef MHD_PLATFORM_H
-#include <stdarg.h>
-#include <stdint.h>
-#include <sys/types.h>
-#if defined(_WIN32) && ! defined(__CYGWIN__)
-#include <ws2tcpip.h>
-#if defined(_MSC_FULL_VER) && ! defined(_SSIZE_T_DEFINED)
-#define _SSIZE_T_DEFINED
-typedef intptr_t ssize_t;
-#endif /* !_SSIZE_T_DEFINED */
-#else
-#include <unistd.h>
-#include <sys/time.h>
-#include <sys/socket.h>
-#endif
-#endif
-
-#if defined(__CYGWIN__) && ! defined(_SYS_TYPES_FD_SET)
-/* Do not define __USE_W32_SOCKETS under Cygwin! */
-#error Cygwin with winsock fd_set is not supported
-#endif
-
-/**
- * Current version of the library.
- * 0x01093001 = 1.9.30-1.
- */
-#define MHD_VERSION 0x01000000
-
-
-/**
- * Representation of 'bool' in the public API as stdbool.h may not
- * always be available.
- */
-enum MHD_Bool
-{
-
-  /**
-   * MHD-internal return code for "NO".
-   */
-  MHD_NO = 0,
-
-  /**
-   * MHD-internal return code for "YES".  All non-zero values
-   * will be interpreted as "YES", but MHD will only ever
-   * return #MHD_YES or #MHD_NO.
-   */
-  MHD_YES = 1
-};
-
-
-/**
- * Constant used to indicate unknown size (use when
- * creating a response).
- */
-#ifdef UINT64_MAX
-#define MHD_SIZE_UNKNOWN UINT64_MAX
-#else
-#define MHD_SIZE_UNKNOWN  ((uint64_t) -1LL)
-#endif
-
-#ifdef SIZE_MAX
-#define MHD_CONTENT_READER_END_OF_STREAM SIZE_MAX
-#define MHD_CONTENT_READER_END_WITH_ERROR (SIZE_MAX - 1)
-#else
-#define MHD_CONTENT_READER_END_OF_STREAM ((size_t) -1LL)
-#define MHD_CONTENT_READER_END_WITH_ERROR (((size_t) -1LL) - 1)
-#endif
-
-#ifndef _MHD_EXTERN
-#if defined(_WIN32) && defined(MHD_W32LIB)
-#define _MHD_EXTERN extern
-#elif defined(_WIN32) && defined(MHD_W32DLL)
-/* Define MHD_W32DLL when using MHD as W32 .DLL to speed up linker a little */
-#define _MHD_EXTERN __declspec(dllimport)
-#else
-#define _MHD_EXTERN extern
-#endif
-#endif
-
-#ifndef MHD_SOCKET_DEFINED
-/**
- * MHD_socket is type for socket FDs
- */
-#if ! defined(_WIN32) || defined(_SYS_TYPES_FD_SET)
-#define MHD_POSIX_SOCKETS 1
-typedef int MHD_socket;
-#define MHD_INVALID_SOCKET (-1)
-#else /* !defined(_WIN32) || defined(_SYS_TYPES_FD_SET) */
-#define MHD_WINSOCK_SOCKETS 1
-#include <winsock2.h>
-typedef SOCKET MHD_socket;
-#define MHD_INVALID_SOCKET (INVALID_SOCKET)
-#endif /* !defined(_WIN32) || defined(_SYS_TYPES_FD_SET) */
-#define MHD_SOCKET_DEFINED 1
-#endif /* MHD_SOCKET_DEFINED */
-
-/**
- * Define MHD_NO_DEPRECATION before including "microhttpd.h" to disable deprecation messages
- */
-#ifdef MHD_NO_DEPRECATION
-#define _MHD_DEPR_MACRO(msg)
-#define _MHD_NO_DEPR_IN_MACRO 1
-#define _MHD_DEPR_IN_MACRO(msg)
-#define _MHD_NO_DEPR_FUNC 1
-#define _MHD_DEPR_FUNC(msg)
-#endif /* MHD_NO_DEPRECATION */
-
-#ifndef _MHD_DEPR_MACRO
-#if defined(_MSC_FULL_VER) && _MSC_VER + 0 >= 1500
-/* VS 2008 or later */
-/* Stringify macros */
-#define _MHD_INSTRMACRO(a) #a
-#define _MHD_STRMACRO(a) _MHD_INSTRMACRO (a)
-/* deprecation message */
-#define _MHD_DEPR_MACRO(msg) __pragma(message (__FILE__ "(" _MHD_STRMACRO ( \
-  __LINE__) "): warning: " msg))
-#define _MHD_DEPR_IN_MACRO(msg) _MHD_DEPR_MACRO (msg)
-#elif defined(__clang__) || defined(__GNUC_PATCHLEVEL__)
-/* clang or GCC since 3.0 */
-#define _MHD_GCC_PRAG(x) _Pragma(#x)
-#if (defined(__clang__) && (__clang_major__ + 0 >= 5 ||     \
-                            (! defined(__apple_build_version__) && \
-  (__clang_major__ + 0  > 3 || (__clang_major__ + 0 == 3 && __clang_minor__ >= \
-                                3))))) || \
-  __GNUC__ + 0 > 4 || (__GNUC__ + 0 == 4 && __GNUC_MINOR__ + 0 >= 8)
-/* clang >= 3.3 (or XCode's clang >= 5.0) or
-   GCC >= 4.8 */
-#define _MHD_DEPR_MACRO(msg) _MHD_GCC_PRAG (GCC warning msg)
-#define _MHD_DEPR_IN_MACRO(msg) _MHD_DEPR_MACRO (msg)
-#else /* older clang or GCC */
-/* clang < 3.3, XCode's clang < 5.0, 3.0 <= GCC < 4.8 */
-#define _MHD_DEPR_MACRO(msg) _MHD_GCC_PRAG (message msg)
-#if (defined(__clang__) && (__clang_major__ + 0  > 2 || (__clang_major__ + 0 == \
-                                                         2 && __clang_minor__ >= \
-                                                         9)))                                            /* FIXME: clang >= 2.9, earlier versions not tested */
-/* clang handles inline pragmas better than GCC */
-#define _MHD_DEPR_IN_MACRO(msg) _MHD_DEPR_MACRO (msg)
-#endif /* clang >= 2.9 */
-#endif  /* older clang or GCC */
-/* #elif defined(SOMEMACRO) */ /* add compiler-specific macros here if required */
-#endif /* clang || GCC >= 3.0 */
-#endif /* !_MHD_DEPR_MACRO */
-
-#ifndef _MHD_DEPR_MACRO
-#define _MHD_DEPR_MACRO(msg)
-#endif /* !_MHD_DEPR_MACRO */
-
-#ifndef _MHD_DEPR_IN_MACRO
-#define _MHD_NO_DEPR_IN_MACRO 1
-#define _MHD_DEPR_IN_MACRO(msg)
-#endif /* !_MHD_DEPR_IN_MACRO */
-
-#ifndef _MHD_DEPR_FUNC
-#if defined(_MSC_FULL_VER) && _MSC_VER + 0 >= 1400
-/* VS 2005 or later */
-#define _MHD_DEPR_FUNC(msg) __declspec(deprecated (msg))
-#elif defined(_MSC_FULL_VER) && _MSC_VER + 0 >= 1310
-/* VS .NET 2003 deprecation do not support custom messages */
-#define _MHD_DEPR_FUNC(msg) __declspec(deprecated)
-#elif (__GNUC__ + 0 >= 5) || (defined(__clang__) && \
-  (__clang_major__ + 0 > 2 || (__clang_major__ + 0 == 2 && __clang_minor__ >= \
-                               9)))                                             /* FIXME: earlier versions not tested */
-/* GCC >= 5.0 or clang >= 2.9 */
-#define _MHD_DEPR_FUNC(msg) __attribute__((deprecated (msg)))
-#elif defined(__clang__) || __GNUC__ + 0 > 3 || (__GNUC__ + 0 == 3 && \
-                                                 __GNUC_MINOR__ + 0 >= 1)
-/* 3.1 <= GCC < 5.0 or clang < 2.9 */
-/* old GCC-style deprecation do not support custom messages */
-#define _MHD_DEPR_FUNC(msg) __attribute__((__deprecated__))
-/* #elif defined(SOMEMACRO) */ /* add compiler-specific macros here if required */
-#endif /* clang < 2.9 || GCC >= 3.1 */
-#endif /* !_MHD_DEPR_FUNC */
-
-#ifndef _MHD_DEPR_FUNC
-#define _MHD_NO_DEPR_FUNC 1
-#define _MHD_DEPR_FUNC(msg)
-#endif /* !_MHD_DEPR_FUNC */
-
-
-/* Define MHD_NONNULL attribute */
-
-/**
- * Macro to indicate that certain parameters must be
- * non-null.  Todo: port to non-gcc platforms.
- */
-#if defined(__CYGWIN__) || defined(_WIN32) || defined(MHD_W32LIB) || \
-  defined(__clang__) || ! defined(__GNUC__)
-#define MHD_NONNULL(...) /* empty */
-#else
-#define MHD_NONNULL(...) __THROW __nonnull ((__VA_ARGS__))
-#endif
-
-/**
- * Not all architectures and `printf()`'s support the `long long` type.
- * This gives the ability to replace `long long` with just a `long`,
- * standard `int` or a `short`.
- */
-#ifndef MHD_UNSIGNED_LONG_LONG
-#define MHD_UNSIGNED_LONG_LONG unsigned long long
-#endif
-/**
- * Format string for printing a variable of type #MHD_LONG_LONG.
- * You should only redefine this if you also define #MHD_LONG_LONG.
- */
-#ifndef MHD_UNSIGNED_LONG_LONG_PRINTF
-#define MHD_UNSIGNED_LONG_LONG_PRINTF "%llu"
-#endif
-
-
-/**
- * @brief Handle for a connection / HTTP request.
- *
- * With HTTP/1.1, multiple requests can be run over the same
- * connection.  However, MHD will only show one request per TCP
- * connection to the client at any given time.
- *
- * Replaces `struct MHD_Connection`, renamed to better reflect
- * what this object truly represents to the application using
- * MHD.
- *
- * @ingroup request
- */
-struct MHD_Request;
-
-
-/**
- * A connection corresponds to the network/stream abstraction.
- * A single network (i.e. TCP) stream may be used for multiple
- * requests, which in HTTP/1.1 must be processed sequentially.
- */
-struct MHD_Connection;
-
-
-/**
- * Return values for reporting errors, also used
- * for logging.
- *
- * A value of 0 indicates success (as a return value).
- * Values between 0 and 10000 must be handled explicitly by the app.
- * Values from 10000-19999 are informational.
- * Values from 20000-29999 indicate successful operations.
- * Values from 30000-39999 indicate unsuccessful (normal) operations.
- * Values from 40000-49999 indicate client errors.
- * Values from 50000-59999 indicate MHD server errors.
- * Values from 60000-69999 indicate application errors.
- */
-enum MHD_StatusCode
-{
-
-  /* 00000-level status codes indicate return values
-     the application must act on. */
-
-  /**
-   * Successful operation (not used for logging).
-   */
-  MHD_SC_OK = 0,
-
-  /**
-   * We were asked to return a timeout, but, there is no timeout.
-   */
-  MHD_SC_NO_TIMEOUT = 1,
-
-
-  /* 10000-level status codes indicate intermediate
-     results of some kind. */
-
-  /**
-   * Informational event, MHD started.
-   */
-  MHD_SC_DAEMON_STARTED = 10000,
-
-  /**
-   * Informational event, we accepted a connection.
-   */
-  MHD_SC_CONNECTION_ACCEPTED = 10001,
-
-  /**
-   * Informational event, thread processing connection termiantes.
-   */
-  MHD_SC_THREAD_TERMINATING = 10002,
-
-  /**
-   * Informational event, state machine status for a connection.
-   */
-  MHD_SC_STATE_MACHINE_STATUS_REPORT = 10003,
-
-  /**
-   * accept() returned transient error.
-   */
-  MHD_SC_ACCEPT_FAILED_EAGAIN = 10004,
-
-
-  /* 20000-level status codes indicate success of some kind. */
-
-  /**
-   * MHD is closing a connection after the client closed it
-   * (perfectly normal end).
-   */
-  MHD_SC_CONNECTION_CLOSED = 20000,
-
-  /**
-   * MHD is closing a connection because the application
-   * logic to generate the response data completed.
-   */
-  MHD_SC_APPLICATION_DATA_GENERATION_FINISHED = 20001,
-
-
-  /* 30000-level status codes indicate transient failures
-     that might go away if the client tries again. */
-
-
-  /**
-   * Resource limit in terms of number of parallel connections
-   * hit.
-   */
-  MHD_SC_LIMIT_CONNECTIONS_REACHED = 30000,
-
-  /**
-   * We failed to allocate memory for poll() syscall.
-   * (May be transient.)
-   */
-  MHD_SC_POLL_MALLOC_FAILURE = 30001,
-
-  /**
-   * The operation failed because the respective
-   * daemon is already too deep inside of the shutdown
-   * activity.
-   */
-  MHD_SC_DAEMON_ALREADY_SHUTDOWN = 30002,
-
-  /**
-   * We failed to start a thread.
-   */
-  MHD_SC_THREAD_LAUNCH_FAILURE = 30003,
-
-  /**
-   * The operation failed because we either have no
-   * listen socket or were already quiesced.
-   */
-  MHD_SC_DAEMON_ALREADY_QUIESCED = 30004,
-
-  /**
-   * The operation failed because client disconnected
-   * faster than we could accept().
-   */
-  MHD_SC_ACCEPT_FAST_DISCONNECT = 30005,
-
-  /**
-   * Operating resource limits hit on accept().
-   */
-  MHD_SC_ACCEPT_SYSTEM_LIMIT_REACHED = 30006,
-
-  /**
-   * Connection was refused by accept policy callback.
-   */
-  MHD_SC_ACCEPT_POLICY_REJECTED = 30007,
-
-  /**
-   * We failed to allocate memory for the connection.
-   * (May be transient.)
-   */
-  MHD_SC_CONNECTION_MALLOC_FAILURE = 30008,
-
-  /**
-   * We failed to allocate memory for the connection's memory pool.
-   * (May be transient.)
-   */
-  MHD_SC_POOL_MALLOC_FAILURE = 30009,
-
-  /**
-   * We failed to forward data from a Web socket to the
-   * application to the remote side due to the socket
-   * being closed prematurely. (May be transient.)
-   */
-  MHD_SC_UPGRADE_FORWARD_INCOMPLETE = 30010,
-
-  /**
-   * We failed to allocate memory for generating the response from our
-   * memory pool.  Likely the request header was too large to leave
-   * enough room.
-   */
-  MHD_SC_CONNECTION_POOL_MALLOC_FAILURE = 30011,
-
-
-  /* 40000-level errors are caused by the HTTP client
-     (or the network) */
-
-  /**
-   * MHD is closing a connection because parsing the
-   * request failed.
-   */
-  MHD_SC_CONNECTION_PARSE_FAIL_CLOSED = 40000,
-
-  /**
-   * MHD is closing a connection because it was reset.
-   */
-  MHD_SC_CONNECTION_RESET_CLOSED = 40001,
-
-  /**
-   * MHD is closing a connection because reading the
-   * request failed.
-   */
-  MHD_SC_CONNECTION_READ_FAIL_CLOSED = 40002,
-
-  /**
-   * MHD is closing a connection because writing the response failed.
-   */
-  MHD_SC_CONNECTION_WRITE_FAIL_CLOSED = 40003,
-
-  /**
-   * MHD is returning an error because the header provided
-   * by the client is too big.
-   */
-  MHD_SC_CLIENT_HEADER_TOO_BIG = 40004,
-
-  /**
-   * An HTTP/1.1 request was sent without the "Host:" header.
-   */
-  MHD_SC_HOST_HEADER_MISSING = 40005,
-
-  /**
-   * The given content length was not a number.
-   */
-  MHD_SC_CONTENT_LENGTH_MALFORMED = 40006,
-
-  /**
-   * The given uploaded, chunked-encoded body was malformed.
-   */
-  MHD_SC_CHUNKED_ENCODING_MALFORMED = 40007,
-
-
-  /* 50000-level errors are because of an error internal
-     to the MHD logic, possibly including our interaction
-     with the operating system (but not the application) */
-
-  /**
-   * This build of MHD does not support TLS, but the application
-   * requested TLS.
-   */
-  MHD_SC_TLS_DISABLED = 50000,
-
-  /**
-   * The application attempted to setup TLS parameters before
-   * enabling TLS.
-   */
-  MHD_SC_TLS_BACKEND_UNINITIALIZED = 50003,
-
-  /**
-   * The selected TLS backend does not yet support this operation.
-   */
-  MHD_SC_TLS_BACKEND_OPERATION_UNSUPPORTED = 50004,
-
-  /**
-   * Failed to setup ITC channel.
-   */
-  MHD_SC_ITC_INITIALIZATION_FAILED = 50005,
-
-  /**
-   * File descriptor for ITC channel too large.
-   */
-  MHD_SC_ITC_DESCRIPTOR_TOO_LARGE = 50006,
-
-  /**
-   * The specified value for the NC length is way too large
-   * for this platform (integer overflow on `size_t`).
-   */
-  MHD_SC_DIGEST_AUTH_NC_LENGTH_TOO_BIG = 50007,
-
-  /**
-   * We failed to allocate memory for the specified nonce
-   * counter array.  The option was not set.
-   */
-  MHD_SC_DIGEST_AUTH_NC_ALLOCATION_FAILURE = 50008,
-
-  /**
-   * This build of the library does not support
-   * digest authentication.
-   */
-  MHD_SC_DIGEST_AUTH_NOT_SUPPORTED_BY_BUILD = 50009,
-
-  /**
-   * IPv6 requested but not supported by this build.
-   */
-  MHD_SC_IPV6_NOT_SUPPORTED_BY_BUILD = 50010,
-
-  /**
-   * We failed to open the listen socket. Maybe the build
-   * supports IPv6, but your kernel does not?
-   */
-  MHD_SC_FAILED_TO_OPEN_LISTEN_SOCKET = 50011,
-
-  /**
-   * Specified address family is not supported by this build.
-   */
-  MHD_SC_AF_NOT_SUPPORTED_BY_BUILD = 50012,
-
-  /**
-   * Failed to enable listen address reuse.
-   */
-  MHD_SC_LISTEN_ADDRESS_REUSE_ENABLE_FAILED = 50013,
-
-  /**
-   * Enabling listen address reuse is not supported by this platform.
-   */
-  MHD_SC_LISTEN_ADDRESS_REUSE_ENABLE_NOT_SUPPORTED = 50014,
-
-  /**
-   * Failed to disable listen address reuse.
-   */
-  MHD_SC_LISTEN_ADDRESS_REUSE_DISABLE_FAILED = 50015,
-
-  /**
-   * Disabling listen address reuse is not supported by this platform.
-   */
-  MHD_SC_LISTEN_ADDRESS_REUSE_DISABLE_NOT_SUPPORTED = 50016,
-
-  /**
-   * We failed to explicitly enable or disable dual stack for
-   * the IPv6 listen socket.  The socket will be used in whatever
-   * the default is the OS gives us.
-   */
-  MHD_SC_LISTEN_DUAL_STACK_CONFIGURATION_FAILED = 50017,
-
-  /**
-   * On this platform, MHD does not support explicitly configuring
-   * dual stack behavior.
-   */
-  MHD_SC_LISTEN_DUAL_STACK_CONFIGURATION_NOT_SUPPORTED = 50018,
-
-  /**
-   * Failed to enable TCP FAST OPEN option.
-   */
-  MHD_SC_FAST_OPEN_FAILURE = 50020,
-
-  /**
-   * Failed to start listening on listen socket.
-   */
-  MHD_SC_LISTEN_FAILURE = 50021,
-
-  /**
-   * Failed to obtain our listen port via introspection.
-   */
-  MHD_SC_LISTEN_PORT_INTROSPECTION_FAILURE = 50022,
-
-  /**
-   * Failed to obtain our listen port via introspection
-   * due to unsupported address family being used.
-   */
-  MHD_SC_LISTEN_PORT_INTROSPECTION_UNKNOWN_AF = 50023,
-
-  /**
-   * We failed to set the listen socket to non-blocking.
-   */
-  MHD_SC_LISTEN_SOCKET_NONBLOCKING_FAILURE = 50024,
-
-  /**
-   * Listen socket value is too large (for use with select()).
-   */
-  MHD_SC_LISTEN_SOCKET_TOO_LARGE = 50025,
-
-  /**
-   * We failed to allocate memory for the thread pool.
-   */
-  MHD_SC_THREAD_POOL_MALLOC_FAILURE = 50026,
-
-  /**
-   * We failed to allocate mutex for thread pool worker.
-   */
-  MHD_SC_THREAD_POOL_CREATE_MUTEX_FAILURE = 50027,
-
-  /**
-   * There was an attempt to upgrade a connection on
-   * a daemon where upgrades are disallowed.
-   */
-  MHD_SC_UPGRADE_ON_DAEMON_WITH_UPGRADE_DISALLOWED = 50028,
-
-  /**
-   * Failed to signal via ITC channel.
-   */
-  MHD_SC_ITC_USE_FAILED = 50029,
-
-  /**
-   * We failed to initialize the main thread for listening.
-   */
-  MHD_SC_THREAD_MAIN_LAUNCH_FAILURE = 50030,
-
-  /**
-   * We failed to initialize the threads for the worker pool.
-   */
-  MHD_SC_THREAD_POOL_LAUNCH_FAILURE = 50031,
-
-  /**
-   * We failed to add a socket to the epoll() set.
-   */
-  MHD_SC_EPOLL_CTL_ADD_FAILED = 50032,
-
-  /**
-   * We failed to create control socket for the epoll().
-   */
-  MHD_SC_EPOLL_CTL_CREATE_FAILED = 50034,
-
-  /**
-   * We failed to configure control socket for the epoll()
-   * to be non-inheritable.
-   */
-  MHD_SC_EPOLL_CTL_CONFIGURE_NOINHERIT_FAILED = 50035,
-
-  /**
-   * We failed to build the FD set because a socket was
-   * outside of the permitted range.
-   */
-  MHD_SC_SOCKET_OUTSIDE_OF_FDSET_RANGE = 50036,
-
-  /**
-   * This daemon was not configured with options that
-   * would allow us to build an FD set for select().
-   */
-  MHD_SC_CONFIGURATION_MISMATCH_FOR_GET_FDSET = 50037,
-
-  /**
-   * This daemon was not configured with options that
-   * would allow us to obtain a meaningful timeout.
-   */
-  MHD_SC_CONFIGURATION_MISMATCH_FOR_GET_TIMEOUT = 50038,
-
-  /**
-   * This daemon was not configured with options that
-   * would allow us to run with select() data.
-   */
-  MHD_SC_CONFIGURATION_MISMATCH_FOR_RUN_SELECT = 50039,
-
-  /**
-   * This daemon was not configured to run with an
-   * external event loop.
-   */
-  MHD_SC_CONFIGURATION_MISMATCH_FOR_RUN_EXTERNAL = 50040,
-
-  /**
-   * Encountered an unexpected event loop style
-   * (should never happen).
-   */
-  MHD_SC_CONFIGURATION_UNEXPECTED_ELS = 50041,
-
-  /**
-   * Encountered an unexpected error from select()
-   * (should never happen).
-   */
-  MHD_SC_UNEXPECTED_SELECT_ERROR = 50042,
-
-  /**
-   * poll() is not supported.
-   */
-  MHD_SC_POLL_NOT_SUPPORTED = 50043,
-
-  /**
-   * Encountered an unexpected error from poll()
-   * (should never happen).
-   */
-  MHD_SC_UNEXPECTED_POLL_ERROR = 50044,
-
-  /**
-   * We failed to configure accepted socket
-   * to not use a signal pipe.
-   */
-  MHD_SC_ACCEPT_CONFIGURE_NOSIGPIPE_FAILED = 50045,
-
-  /**
-   * Encountered an unexpected error from epoll_wait()
-   * (should never happen).
-   */
-  MHD_SC_UNEXPECTED_EPOLL_WAIT_ERROR = 50046,
-
-  /**
-   * epoll file descriptor is invalid (strange)
-   */
-  MHD_SC_EPOLL_FD_INVALID = 50047,
-
-  /**
-   * We failed to configure accepted socket
-   * to be non-inheritable.
-   */
-  MHD_SC_ACCEPT_CONFIGURE_NOINHERIT_FAILED = 50048,
-
-  /**
-   * We failed to configure accepted socket
-   * to be non-blocking.
-   */
-  MHD_SC_ACCEPT_CONFIGURE_NONBLOCKING_FAILED = 50049,
-
-  /**
-   * accept() returned non-transient error.
-   */
-  MHD_SC_ACCEPT_FAILED_UNEXPECTEDLY = 50050,
-
-  /**
-   * Operating resource limits hit on accept() while
-   * zero connections are active. Oopsie.
-   */
-  MHD_SC_ACCEPT_SYSTEM_LIMIT_REACHED_INSTANTLY = 50051,
-
-  /**
-   * Failed to add IP address to per-IP counter for
-   * some reason.
-   */
-  MHD_SC_IP_COUNTER_FAILURE = 50052,
-
-  /**
-   * Application violated our API by calling shutdown
-   * while having an upgrade connection still open.
-   */
-  MHD_SC_SHUTDOWN_WITH_OPEN_UPGRADED_CONNECTION = 50053,
-
-  /**
-   * Due to an unexpected internal error with the
-   * state machine, we closed the connection.
-   */
-  MHD_SC_STATEMACHINE_FAILURE_CONNECTION_CLOSED = 50054,
-
-  /**
-   * Failed to allocate memory in connection's pool
-   * to parse the cookie header.
-   */
-  MHD_SC_COOKIE_POOL_ALLOCATION_FAILURE = 50055,
-
-  /**
-   * MHD failed to build the response header.
-   */
-  MHD_SC_FAILED_RESPONSE_HEADER_GENERATION = 50056,
-
-
-  /* 60000-level errors are because the application
-     logic did something wrong or generated an error. */
-
-  /**
-   * MHD does not support the requested combination of
-   * EPOLL with thread-per-connection mode.
-   */
-  MHD_SC_SYSCALL_THREAD_COMBINATION_INVALID = 60000,
-
-  /**
-   * MHD does not support quiescing if ITC was disabled
-   * and threads are used.
-   */
-  MHD_SC_SYSCALL_QUIESCE_REQUIRES_ITC = 60001,
-
-  /**
-   * We failed to bind the listen socket.
-   */
-  MHD_SC_LISTEN_SOCKET_BIND_FAILED = 60002,
-
-  /**
-   * The application requested an unsupported TLS backend to be used.
-   */
-  MHD_SC_TLS_BACKEND_UNSUPPORTED = 60003,
-
-  /**
-   * The application requested a TLS cipher suite which is not
-   * supported by the selected backend.
-   */
-  MHD_SC_TLS_CIPHERS_INVALID = 60004,
-
-  /**
-   * MHD is closing a connection because the application
-   * logic to generate the response data failed.
-   */
-  MHD_SC_APPLICATION_DATA_GENERATION_FAILURE_CLOSED = 60005,
-
-  /**
-   * MHD is closing a connection because the application
-   * callback told it to do so.
-   */
-  MHD_SC_APPLICATION_CALLBACK_FAILURE_CLOSED = 60006,
-
-  /**
-   * Application only partially processed upload and did
-   * not suspend connection. This may result in a hung
-   * connection.
-   */
-  MHD_SC_APPLICATION_HUNG_CONNECTION = 60007,
-
-  /**
-   * Application only partially processed upload and did
-   * not suspend connection and the read buffer was maxxed
-   * out, so MHD closed the connection.
-   */
-  MHD_SC_APPLICATION_HUNG_CONNECTION_CLOSED = 60008,
-
-
-};
-
-
-/**
- * Actions are returned by the application to drive the request
- * handling of MHD.
- */
-struct MHD_Action;
-
-
-/**
- * HTTP methods explicitly supported by MHD.  Note that for
- * non-canonical methods, MHD will return #MHD_METHOD_UNKNOWN
- * and you can use #MHD_REQUEST_INFORMATION_HTTP_METHOD to get
- * the original string.
- *
- * However, applications must check for "#MHD_METHOD_UNKNOWN" *or* any
- * enum-value above those in this list, as future versions of MHD may
- * add additional methods (as per IANA registry), thus even if the API
- * returns "unknown" today, it may return a method-specific header in
- * the future!
- *
- * @defgroup methods HTTP methods
- * HTTP methods (as strings).
- * See: http://www.iana.org/assignments/http-methods/http-methods.xml
- * Registry Version 2015-05-19
- * @{
- */
-enum MHD_Method
-{
-
-  /**
-   * Method did not match any of the methods given below.
-   */
-  MHD_METHOD_UNKNOWN = 0,
-
-  /**
-   * "OPTIONS" method.
-   * Safe.     Idempotent.     RFC7231, Section 4.3.7.
-   */
-  MHD_METHOD_OPTIONS = 1,
-
-  /**
-   * "GET" method.
-   * Safe.     Idempotent.     RFC7231, Section 4.3.1.
-   */
-  MHD_METHOD_GET = 2,
-
-  /**
-   * "HEAD" method.
-   * Safe.     Idempotent.     RFC7231, Section 4.3.2.
-   */
-  MHD_METHOD_HEAD = 3,
-
-  /**
-   * "POST" method.
-   * Not safe. Not idempotent. RFC7231, Section 4.3.3.
-   */
-  MHD_METHOD_POST = 4,
-
-  /**
-   * "PUT" method.
-   * Not safe. Idempotent.     RFC7231, Section 4.3.4.
-   */
-  MHD_METHOD_PUT = 5,
-
-  /**
-   * "DELETE" method.
-   * Not safe. Idempotent.     RFC7231, Section 4.3.5.
-   */
-  MHD_METHOD_DELETE = 6,
-
-  /**
-   * "TRACE" method.
-   */
-  MHD_METHOD_TRACE = 7,
-
-  /**
-   * "CONNECT" method.
-   */
-  MHD_METHOD_CONNECT = 8,
-
-  /**
-   * "ACL" method.
-   */
-  MHD_METHOD_ACL = 9,
-
-  /**
-   * "BASELINE-CONTROL" method.
-   */
-  MHD_METHOD_BASELINE_CONTROL = 10,
-
-  /**
-   * "BIND" method.
-   */
-  MHD_METHOD_BIND = 11,
-
-  /**
-   * "CHECKIN" method.
-   */
-  MHD_METHOD_CHECKIN = 12,
-
-  /**
-   * "CHECKOUT" method.
-   */
-  MHD_METHOD_CHECKOUT = 13,
-
-  /**
-   * "COPY" method.
-   */
-  MHD_METHOD_COPY = 14,
-
-  /**
-   * "LABEL" method.
-   */
-  MHD_METHOD_LABEL = 15,
-
-  /**
-   * "LINK" method.
-   */
-  MHD_METHOD_LINK = 16,
-
-  /**
-   * "LOCK" method.
-   */
-  MHD_METHOD_LOCK = 17,
-
-  /**
-   * "MERGE" method.
-   */
-  MHD_METHOD_MERGE = 18,
-
-  /**
-   * "MKACTIVITY" method.
-   */
-  MHD_METHOD_MKACTIVITY = 19,
-
-  /**
-   * "MKCOL" method.
-   */
-  MHD_METHOD_MKCOL = 20,
-
-  /**
-   * "MKREDIRECTREF" method.
-   */
-  MHD_METHOD_MKREDIRECTREF = 21,
-
-  /**
-   * "MKWORKSPACE" method.
-   */
-  MHD_METHOD_MKWORKSPACE = 22,
-
-  /**
-   * "MOVE" method.
-   */
-  MHD_METHOD_MOVE = 23,
-
-  /**
-   * "ORDERPATCH" method.
-   */
-  MHD_METHOD_ORDERPATCH = 24,
-
-  /**
-   * "PATCH" method.
-   */
-  MHD_METHOD_PATH = 25,
-
-  /**
-   * "PRI" method.
-   */
-  MHD_METHOD_PRI = 26,
-
-  /**
-   * "PROPFIND" method.
-   */
-  MHD_METHOD_PROPFIND = 27,
-
-  /**
-   * "PROPPATCH" method.
-   */
-  MHD_METHOD_PROPPATCH = 28,
-
-  /**
-   * "REBIND" method.
-   */
-  MHD_METHOD_REBIND = 29,
-
-  /**
-   * "REPORT" method.
-   */
-  MHD_METHOD_REPORT = 30,
-
-  /**
-   * "SEARCH" method.
-   */
-  MHD_METHOD_SEARCH = 31,
-
-  /**
-   * "UNBIND" method.
-   */
-  MHD_METHOD_UNBIND = 32,
-
-  /**
-   * "UNCHECKOUT" method.
-   */
-  MHD_METHOD_UNCHECKOUT = 33,
-
-  /**
-   * "UNLINK" method.
-   */
-  MHD_METHOD_UNLINK = 34,
-
-  /**
-   * "UNLOCK" method.
-   */
-  MHD_METHOD_UNLOCK = 35,
-
-  /**
-   * "UPDATE" method.
-   */
-  MHD_METHOD_UPDATE = 36,
-
-  /**
-   * "UPDATEDIRECTREF" method.
-   */
-  MHD_METHOD_UPDATEDIRECTREF = 37,
-
-  /**
-   * "VERSION-CONTROL" method.
-   */
-  MHD_METHOD_VERSION_CONTROL = 38
-
-                               /* For more, check:
-                                  https://www.iana.org/assignments/http-methods/http-methods.xhtml */
-
-};
-
-/** @} */ /* end of group methods */
-
-
-/**
- * @defgroup postenc HTTP POST encodings
- * See also: http://www.w3.org/TR/html4/interact/forms.html#h-17.13.4
- * @{
- */
-#define MHD_HTTP_POST_ENCODING_FORM_URLENCODED \
-  "application/x-www-form-urlencoded"
-#define MHD_HTTP_POST_ENCODING_MULTIPART_FORMDATA "multipart/form-data"
-
-/** @} */ /* end of group postenc */
-
-
-/**
- * @defgroup headers HTTP headers
- * These are the standard headers found in HTTP requests and responses.
- * See: http://www.iana.org/assignments/message-headers/message-headers.xml
- * Registry Version 2017-01-27
- * @{
- */
-
-/* Main HTTP headers. */
-/* Standard.      RFC7231, Section 5.3.2 */
-#define MHD_HTTP_HEADER_ACCEPT "Accept"
-/* Standard.      RFC7231, Section 5.3.3 */
-#define MHD_HTTP_HEADER_ACCEPT_CHARSET "Accept-Charset"
-/* Standard.      RFC7231, Section 5.3.4; RFC7694, Section 3 */
-#define MHD_HTTP_HEADER_ACCEPT_ENCODING "Accept-Encoding"
-/* Standard.      RFC7231, Section 5.3.5 */
-#define MHD_HTTP_HEADER_ACCEPT_LANGUAGE "Accept-Language"
-/* Standard.      RFC7233, Section 2.3 */
-#define MHD_HTTP_HEADER_ACCEPT_RANGES "Accept-Ranges"
-/* Standard.      RFC7234, Section 5.1 */
-#define MHD_HTTP_HEADER_AGE "Age"
-/* Standard.      RFC7231, Section 7.4.1 */
-#define MHD_HTTP_HEADER_ALLOW "Allow"
-/* Standard.      RFC7235, Section 4.2 */
-#define MHD_HTTP_HEADER_AUTHORIZATION "Authorization"
-/* Standard.      RFC7234, Section 5.2 */
-#define MHD_HTTP_HEADER_CACHE_CONTROL "Cache-Control"
-/* Reserved.      RFC7230, Section 8.1 */
-#define MHD_HTTP_HEADER_CLOSE "Close"
-/* Standard.      RFC7230, Section 6.1 */
-#define MHD_HTTP_HEADER_CONNECTION "Connection"
-/* Standard.      RFC7231, Section 3.1.2.2 */
-#define MHD_HTTP_HEADER_CONTENT_ENCODING "Content-Encoding"
-/* Standard.      RFC7231, Section 3.1.3.2 */
-#define MHD_HTTP_HEADER_CONTENT_LANGUAGE "Content-Language"
-/* Standard.      RFC7230, Section 3.3.2 */
-#define MHD_HTTP_HEADER_CONTENT_LENGTH "Content-Length"
-/* Standard.      RFC7231, Section 3.1.4.2 */
-#define MHD_HTTP_HEADER_CONTENT_LOCATION "Content-Location"
-/* Standard.      RFC7233, Section 4.2 */
-#define MHD_HTTP_HEADER_CONTENT_RANGE "Content-Range"
-/* Standard.      RFC7231, Section 3.1.1.5 */
-#define MHD_HTTP_HEADER_CONTENT_TYPE "Content-Type"
-/* Standard.      RFC7231, Section 7.1.1.2 */
-#define MHD_HTTP_HEADER_DATE "Date"
-/* Standard.      RFC7232, Section 2.3 */
-#define MHD_HTTP_HEADER_ETAG "ETag"
-/* Standard.      RFC7231, Section 5.1.1 */
-#define MHD_HTTP_HEADER_EXPECT "Expect"
-/* Standard.      RFC7234, Section 5.3 */
-#define MHD_HTTP_HEADER_EXPIRES "Expires"
-/* Standard.      RFC7231, Section 5.5.1 */
-#define MHD_HTTP_HEADER_FROM "From"
-/* Standard.      RFC7230, Section 5.4 */
-#define MHD_HTTP_HEADER_HOST "Host"
-/* Standard.      RFC7232, Section 3.1 */
-#define MHD_HTTP_HEADER_IF_MATCH "If-Match"
-/* Standard.      RFC7232, Section 3.3 */
-#define MHD_HTTP_HEADER_IF_MODIFIED_SINCE "If-Modified-Since"
-/* Standard.      RFC7232, Section 3.2 */
-#define MHD_HTTP_HEADER_IF_NONE_MATCH "If-None-Match"
-/* Standard.      RFC7233, Section 3.2 */
-#define MHD_HTTP_HEADER_IF_RANGE "If-Range"
-/* Standard.      RFC7232, Section 3.4 */
-#define MHD_HTTP_HEADER_IF_UNMODIFIED_SINCE "If-Unmodified-Since"
-/* Standard.      RFC7232, Section 2.2 */
-#define MHD_HTTP_HEADER_LAST_MODIFIED "Last-Modified"
-/* Standard.      RFC7231, Section 7.1.2 */
-#define MHD_HTTP_HEADER_LOCATION "Location"
-/* Standard.      RFC7231, Section 5.1.2 */
-#define MHD_HTTP_HEADER_MAX_FORWARDS "Max-Forwards"
-/* Standard.      RFC7231, Appendix A.1 */
-#define MHD_HTTP_HEADER_MIME_VERSION "MIME-Version"
-/* Standard.      RFC7234, Section 5.4 */
-#define MHD_HTTP_HEADER_PRAGMA "Pragma"
-/* Standard.      RFC7235, Section 4.3 */
-#define MHD_HTTP_HEADER_PROXY_AUTHENTICATE "Proxy-Authenticate"
-/* Standard.      RFC7235, Section 4.4 */
-#define MHD_HTTP_HEADER_PROXY_AUTHORIZATION "Proxy-Authorization"
-/* Standard.      RFC7233, Section 3.1 */
-#define MHD_HTTP_HEADER_RANGE "Range"
-/* Standard.      RFC7231, Section 5.5.2 */
-#define MHD_HTTP_HEADER_REFERER "Referer"
-/* Standard.      RFC7231, Section 7.1.3 */
-#define MHD_HTTP_HEADER_RETRY_AFTER "Retry-After"
-/* Standard.      RFC7231, Section 7.4.2 */
-#define MHD_HTTP_HEADER_SERVER "Server"
-/* Standard.      RFC7230, Section 4.3 */
-#define MHD_HTTP_HEADER_TE "TE"
-/* Standard.      RFC7230, Section 4.4 */
-#define MHD_HTTP_HEADER_TRAILER "Trailer"
-/* Standard.      RFC7230, Section 3.3.1 */
-#define MHD_HTTP_HEADER_TRANSFER_ENCODING "Transfer-Encoding"
-/* Standard.      RFC7230, Section 6.7 */
-#define MHD_HTTP_HEADER_UPGRADE "Upgrade"
-/* Standard.      RFC7231, Section 5.5.3 */
-#define MHD_HTTP_HEADER_USER_AGENT "User-Agent"
-/* Standard.      RFC7231, Section 7.1.4 */
-#define MHD_HTTP_HEADER_VARY "Vary"
-/* Standard.      RFC7230, Section 5.7.1 */
-#define MHD_HTTP_HEADER_VIA "Via"
-/* Standard.      RFC7235, Section 4.1 */
-#define MHD_HTTP_HEADER_WWW_AUTHENTICATE "WWW-Authenticate"
-/* Standard.      RFC7234, Section 5.5 */
-#define MHD_HTTP_HEADER_WARNING "Warning"
-
-/* Additional HTTP headers. */
-/* No category.   RFC4229 */
-#define MHD_HTTP_HEADER_A_IM "A-IM"
-/* No category.   RFC4229 */
-#define MHD_HTTP_HEADER_ACCEPT_ADDITIONS "Accept-Additions"
-/* Informational. RFC7089 */
-#define MHD_HTTP_HEADER_ACCEPT_DATETIME "Accept-Datetime"
-/* No category.   RFC4229 */
-#define MHD_HTTP_HEADER_ACCEPT_FEATURES "Accept-Features"
-/* No category.   RFC5789 */
-#define MHD_HTTP_HEADER_ACCEPT_PATCH "Accept-Patch"
-/* Standard.      RFC7639, Section 2 */
-#define MHD_HTTP_HEADER_ALPN "ALPN"
-/* Standard.      RFC7838 */
-#define MHD_HTTP_HEADER_ALT_SVC "Alt-Svc"
-/* Standard.      RFC7838 */
-#define MHD_HTTP_HEADER_ALT_USED "Alt-Used"
-/* No category.   RFC4229 */
-#define MHD_HTTP_HEADER_ALTERNATES "Alternates"
-/* No category.   RFC4437 */
-#define MHD_HTTP_HEADER_APPLY_TO_REDIRECT_REF "Apply-To-Redirect-Ref"
-/* Experimental.  RFC8053, Section 4 */
-#define MHD_HTTP_HEADER_AUTHENTICATION_CONTROL "Authentication-Control"
-/* Standard.      RFC7615, Section 3 */
-#define MHD_HTTP_HEADER_AUTHENTICATION_INFO "Authentication-Info"
-/* No category.   RFC4229 */
-#define MHD_HTTP_HEADER_C_EXT "C-Ext"
-/* No category.   RFC4229 */
-#define MHD_HTTP_HEADER_C_MAN "C-Man"
-/* No category.   RFC4229 */
-#define MHD_HTTP_HEADER_C_OPT "C-Opt"
-/* No category.   RFC4229 */
-#define MHD_HTTP_HEADER_C_PEP "C-PEP"
-/* No category.   RFC4229 */
-#define MHD_HTTP_HEADER_C_PEP_INFO "C-PEP-Info"
-/* Standard.      RFC7809, Section 7.1 */
-#define MHD_HTTP_HEADER_CALDAV_TIMEZONES "CalDAV-Timezones"
-/* Obsoleted.     RFC2068; RFC2616 */
-#define MHD_HTTP_HEADER_CONTENT_BASE "Content-Base"
-/* Standard.      RFC6266 */
-#define MHD_HTTP_HEADER_CONTENT_DISPOSITION "Content-Disposition"
-/* No category.   RFC4229 */
-#define MHD_HTTP_HEADER_CONTENT_ID "Content-ID"
-/* No category.   RFC4229 */
-#define MHD_HTTP_HEADER_CONTENT_MD5 "Content-MD5"
-/* No category.   RFC4229 */
-#define MHD_HTTP_HEADER_CONTENT_SCRIPT_TYPE "Content-Script-Type"
-/* No category.   RFC4229 */
-#define MHD_HTTP_HEADER_CONTENT_STYLE_TYPE "Content-Style-Type"
-/* No category.   RFC4229 */
-#define MHD_HTTP_HEADER_CONTENT_VERSION "Content-Version"
-/* Standard.      RFC6265 */
-#define MHD_HTTP_HEADER_COOKIE "Cookie"
-/* Obsoleted.     RFC2965; RFC6265 */
-#define MHD_HTTP_HEADER_COOKIE2 "Cookie2"
-/* Standard.      RFC5323 */
-#define MHD_HTTP_HEADER_DASL "DASL"
-/* Standard.      RFC4918 */
-#define MHD_HTTP_HEADER_DAV "DAV"
-/* No category.   RFC4229 */
-#define MHD_HTTP_HEADER_DEFAULT_STYLE "Default-Style"
-/* No category.   RFC4229 */
-#define MHD_HTTP_HEADER_DELTA_BASE "Delta-Base"
-/* Standard.      RFC4918 */
-#define MHD_HTTP_HEADER_DEPTH "Depth"
-/* No category.   RFC4229 */
-#define MHD_HTTP_HEADER_DERIVED_FROM "Derived-From"
-/* Standard.      RFC4918 */
-#define MHD_HTTP_HEADER_DESTINATION "Destination"
-/* No category.   RFC4229 */
-#define MHD_HTTP_HEADER_DIFFERENTIAL_ID "Differential-ID"
-/* No category.   RFC4229 */
-#define MHD_HTTP_HEADER_DIGEST "Digest"
-/* No category.   RFC4229 */
-#define MHD_HTTP_HEADER_EXT "Ext"
-/* Standard.      RFC7239 */
-#define MHD_HTTP_HEADER_FORWARDED "Forwarded"
-/* No category.   RFC4229 */
-#define MHD_HTTP_HEADER_GETPROFILE "GetProfile"
-/* Experimental.  RFC7486, Section 6.1.1 */
-#define MHD_HTTP_HEADER_HOBAREG "Hobareg"
-/* Standard.      RFC7540, Section 3.2.1 */
-#define MHD_HTTP_HEADER_HTTP2_SETTINGS "HTTP2-Settings"
-/* No category.   RFC4229 */
-#define MHD_HTTP_HEADER_IM "IM"
-/* Standard.      RFC4918 */
-#define MHD_HTTP_HEADER_IF "If"
-/* Standard.      RFC6638 */
-#define MHD_HTTP_HEADER_IF_SCHEDULE_TAG_MATCH "If-Schedule-Tag-Match"
-/* No category.   RFC4229 */
-#define MHD_HTTP_HEADER_KEEP_ALIVE "Keep-Alive"
-/* No category.   RFC4229 */
-#define MHD_HTTP_HEADER_LABEL "Label"
-/* No category.   RFC5988 */
-#define MHD_HTTP_HEADER_LINK "Link"
-/* Standard.      RFC4918 */
-#define MHD_HTTP_HEADER_LOCK_TOKEN "Lock-Token"
-/* No category.   RFC4229 */
-#define MHD_HTTP_HEADER_MAN "Man"
-/* Informational. RFC7089 */
-#define MHD_HTTP_HEADER_MEMENTO_DATETIME "Memento-Datetime"
-/* No category.   RFC4229 */
-#define MHD_HTTP_HEADER_METER "Meter"
-/* No category.   RFC4229 */
-#define MHD_HTTP_HEADER_NEGOTIATE "Negotiate"
-/* No category.   RFC4229 */
-#define MHD_HTTP_HEADER_OPT "Opt"
-/* Experimental.  RFC8053, Section 3 */
-#define MHD_HTTP_HEADER_OPTIONAL_WWW_AUTHENTICATE "Optional-WWW-Authenticate"
-/* Standard.      RFC4229 */
-#define MHD_HTTP_HEADER_ORDERING_TYPE "Ordering-Type"
-/* Standard.      RFC6454 */
-#define MHD_HTTP_HEADER_ORIGIN "Origin"
-/* Standard.      RFC4918 */
-#define MHD_HTTP_HEADER_OVERWRITE "Overwrite"
-/* No category.   RFC4229 */
-#define MHD_HTTP_HEADER_P3P "P3P"
-/* No category.   RFC4229 */
-#define MHD_HTTP_HEADER_PEP "PEP"
-/* No category.   RFC4229 */
-#define MHD_HTTP_HEADER_PICS_LABEL "PICS-Label"
-/* No category.   RFC4229 */
-#define MHD_HTTP_HEADER_PEP_INFO "Pep-Info"
-/* Standard.      RFC4229 */
-#define MHD_HTTP_HEADER_POSITION "Position"
-/* Standard.      RFC7240 */
-#define MHD_HTTP_HEADER_PREFER "Prefer"
-/* Standard.      RFC7240 */
-#define MHD_HTTP_HEADER_PREFERENCE_APPLIED "Preference-Applied"
-/* No category.   RFC4229 */
-#define MHD_HTTP_HEADER_PROFILEOBJECT "ProfileObject"
-/* No category.   RFC4229 */
-#define MHD_HTTP_HEADER_PROTOCOL "Protocol"
-/* No category.   RFC4229 */
-#define MHD_HTTP_HEADER_PROTOCOL_INFO "Protocol-Info"
-/* No category.   RFC4229 */
-#define MHD_HTTP_HEADER_PROTOCOL_QUERY "Protocol-Query"
-/* No category.   RFC4229 */
-#define MHD_HTTP_HEADER_PROTOCOL_REQUEST "Protocol-Request"
-/* Standard.      RFC7615, Section 4 */
-#define MHD_HTTP_HEADER_PROXY_AUTHENTICATION_INFO "Proxy-Authentication-Info"
-/* No category.   RFC4229 */
-#define MHD_HTTP_HEADER_PROXY_FEATURES "Proxy-Features"
-/* No category.   RFC4229 */
-#define MHD_HTTP_HEADER_PROXY_INSTRUCTION "Proxy-Instruction"
-/* No category.   RFC4229 */
-#define MHD_HTTP_HEADER_PUBLIC "Public"
-/* Standard.      RFC7469 */
-#define MHD_HTTP_HEADER_PUBLIC_KEY_PINS "Public-Key-Pins"
-/* Standard.      RFC7469 */
-#define MHD_HTTP_HEADER_PUBLIC_KEY_PINS_REPORT_ONLY \
-  "Public-Key-Pins-Report-Only"
-/* No category.   RFC4437 */
-#define MHD_HTTP_HEADER_REDIRECT_REF "Redirect-Ref"
-/* No category.   RFC4229 */
-#define MHD_HTTP_HEADER_SAFE "Safe"
-/* Standard.      RFC6638 */
-#define MHD_HTTP_HEADER_SCHEDULE_REPLY "Schedule-Reply"
-/* Standard.      RFC6638 */
-#define MHD_HTTP_HEADER_SCHEDULE_TAG "Schedule-Tag"
-/* Standard.      RFC6455 */
-#define MHD_HTTP_HEADER_SEC_WEBSOCKET_ACCEPT "Sec-WebSocket-Accept"
-/* Standard.      RFC6455 */
-#define MHD_HTTP_HEADER_SEC_WEBSOCKET_EXTENSIONS "Sec-WebSocket-Extensions"
-/* Standard.      RFC6455 */
-#define MHD_HTTP_HEADER_SEC_WEBSOCKET_KEY "Sec-WebSocket-Key"
-/* Standard.      RFC6455 */
-#define MHD_HTTP_HEADER_SEC_WEBSOCKET_PROTOCOL "Sec-WebSocket-Protocol"
-/* Standard.      RFC6455 */
-#define MHD_HTTP_HEADER_SEC_WEBSOCKET_VERSION "Sec-WebSocket-Version"
-/* No category.   RFC4229 */
-#define MHD_HTTP_HEADER_SECURITY_SCHEME "Security-Scheme"
-/* Standard.      RFC6265 */
-#define MHD_HTTP_HEADER_SET_COOKIE "Set-Cookie"
-/* Obsoleted.     RFC2965; RFC6265 */
-#define MHD_HTTP_HEADER_SET_COOKIE2 "Set-Cookie2"
-/* No category.   RFC4229 */
-#define MHD_HTTP_HEADER_SETPROFILE "SetProfile"
-/* Standard.      RFC5023 */
-#define MHD_HTTP_HEADER_SLUG "SLUG"
-/* No category.   RFC4229 */
-#define MHD_HTTP_HEADER_SOAPACTION "SoapAction"
-/* No category.   RFC4229 */
-#define MHD_HTTP_HEADER_STATUS_URI "Status-URI"
-/* Standard.      RFC6797 */
-#define MHD_HTTP_HEADER_STRICT_TRANSPORT_SECURITY "Strict-Transport-Security"
-/* No category.   RFC4229 */
-#define MHD_HTTP_HEADER_SURROGATE_CAPABILITY "Surrogate-Capability"
-/* No category.   RFC4229 */
-#define MHD_HTTP_HEADER_SURROGATE_CONTROL "Surrogate-Control"
-/* No category.   RFC4229 */
-#define MHD_HTTP_HEADER_TCN "TCN"
-/* Standard.      RFC4918 */
-#define MHD_HTTP_HEADER_TIMEOUT "Timeout"
-/* Standard.      RFC8030, Section 5.4 */
-#define MHD_HTTP_HEADER_TOPIC "Topic"
-/* Standard.      RFC8030, Section 5.2 */
-#define MHD_HTTP_HEADER_TTL "TTL"
-/* Standard.      RFC8030, Section 5.3 */
-#define MHD_HTTP_HEADER_URGENCY "Urgency"
-/* No category.   RFC4229 */
-#define MHD_HTTP_HEADER_URI "URI"
-/* No category.   RFC4229 */
-#define MHD_HTTP_HEADER_VARIANT_VARY "Variant-Vary"
-/* No category.   RFC4229 */
-#define MHD_HTTP_HEADER_WANT_DIGEST "Want-Digest"
-/* Informational. RFC7034 */
-#define MHD_HTTP_HEADER_X_FRAME_OPTIONS "X-Frame-Options"
-
-/* Some provisional headers. */
-#define MHD_HTTP_HEADER_ACCESS_CONTROL_ALLOW_ORIGIN \
-  "Access-Control-Allow-Origin"
-/** @} */ /* end of group headers */
-
-
-/**
- * A client has requested the given url using the given method
- * (#MHD_HTTP_METHOD_GET, #MHD_HTTP_METHOD_PUT,
- * #MHD_HTTP_METHOD_DELETE, #MHD_HTTP_METHOD_POST, etc).  The callback
- * must initialize @a rhp to provide further callbacks which will
- * process the request further and ultimately to provide the response
- * to give back to the client, or return #MHD_NO.
- *
- * @param cls argument given together with the function
- *        pointer when the handler was registered with MHD
- * @param url the requested url (without arguments after "?")
- * @param method the HTTP method used (#MHD_HTTP_METHOD_GET,
- *        #MHD_HTTP_METHOD_PUT, etc.)
- * @return action how to proceed, NULL
- *         if the socket must be closed due to a serious
- *         error while handling the request
- */
-typedef const struct MHD_Action *
-(*MHD_RequestCallback) (void *cls,
-                        struct MHD_Request *request,
-                        const char *url,
-                        enum MHD_Method method);
-
-
-/**
- * Create (but do not yet start) an MHD daemon.
- * Usually, you will want to set various options before
- * starting the daemon with #MHD_daemon_start().
- *
- * @param cb function to be called for incoming requests
- * @param cb_cls closure for @a cb
- * @return NULL on error
- */
-_MHD_EXTERN struct MHD_Daemon *
-MHD_daemon_create (MHD_RequestCallback cb,
-                   void *cb_cls)
-MHD_NONNULL (1);
-
-
-/**
- * Start a webserver.
- *
- * @param daemon daemon to start; you can no longer set
- *        options on this daemon after this call!
- * @return #MHD_SC_OK on success
- * @ingroup event
- */
-_MHD_EXTERN enum MHD_StatusCode
-MHD_daemon_start (struct MHD_Daemon *daemon)
-MHD_NONNULL (1);
-
-
-/**
- * Stop accepting connections from the listening socket.  Allows
- * clients to continue processing, but stops accepting new
- * connections.  Note that the caller is responsible for closing the
- * returned socket; however, if MHD is run using threads (anything but
- * external select mode), it must not be closed until AFTER
- * #MHD_stop_daemon has been called (as it is theoretically possible
- * that an existing thread is still using it).
- *
- * Note that some thread modes require the caller to have passed
- * #MHD_USE_ITC when using this API.  If this daemon is
- * in one of those modes and this option was not given to
- * #MHD_start_daemon, this function will return #MHD_INVALID_SOCKET.
- *
- * @param daemon daemon to stop accepting new connections for
- * @return old listen socket on success, #MHD_INVALID_SOCKET if
- *         the daemon was already not listening anymore, or
- *         was never started
- * @ingroup specialized
- */
-_MHD_EXTERN MHD_socket
-MHD_daemon_quiesce (struct MHD_Daemon *daemon)
-MHD_NONNULL (1);
-
-
-/**
- * Shutdown and destroy an HTTP daemon.
- *
- * @param daemon daemon to stop
- * @ingroup event
- */
-_MHD_EXTERN void
-MHD_daemon_destroy (struct MHD_Daemon *daemon)
-MHD_NONNULL (1);
-
-
-/**
- * Add another client connection to the set of connections managed by
- * MHD.  This API is usually not needed (since MHD will accept inbound
- * connections on the server socket).  Use this API in special cases,
- * for example if your HTTP server is behind NAT and needs to connect
- * out to the HTTP client, or if you are building a proxy.
- *
- * If you use this API in conjunction with a internal select or a
- * thread pool, you must set the option #MHD_USE_ITC to ensure that
- * the freshly added connection is immediately processed by MHD.
- *
- * The given client socket will be managed (and closed!) by MHD after
- * this call and must no longer be used directly by the application
- * afterwards.
- *
- * @param daemon daemon that manages the connection
- * @param client_socket socket to manage (MHD will expect
- *        to receive an HTTP request from this socket next).
- * @param addr IP address of the client
- * @param addrlen number of bytes in @a addr
- * @return #MHD_SC_OK on success
- *        The socket will be closed in any case; `errno` is
- *        set to indicate further details about the error.
- * @ingroup specialized
- */
-_MHD_EXTERN enum MHD_StatusCode
-MHD_daemon_add_connection (struct MHD_Daemon *daemon,
-                           MHD_socket client_socket,
-                           const struct sockaddr *addr,
-                           socklen_t addrlen)
-MHD_NONNULL (1);
-
-
-/**
- * Obtain the `select()` sets for this daemon.  Daemon's FDs will be
- * added to fd_sets. To get only daemon FDs in fd_sets, call FD_ZERO
- * for each fd_set before calling this function. FD_SETSIZE is assumed
- * to be platform's default.
- *
- * This function should only be called in when MHD is configured to
- * use external select with 'select()' or with 'epoll'.  In the latter
- * case, it will only add the single 'epoll()' file descriptor used by
- * MHD to the sets.  It's necessary to use #MHD_get_timeout() in
- * combination with this function.
- *
- * This function must be called only for daemon started without
- * #MHD_USE_INTERNAL_POLLING_THREAD flag.
- *
- * @param daemon daemon to get sets from
- * @param read_fd_set read set
- * @param write_fd_set write set
- * @param except_fd_set except set
- * @param max_fd increased to largest FD added (if larger
- *               than existing value); can be NULL
- * @return #MHD_SC_OK on success, otherwise error code
- * @ingroup event
- */
-_MHD_EXTERN enum MHD_StatusCode
-MHD_daemon_get_fdset (struct MHD_Daemon *daemon,
-                      fd_set *read_fd_set,
-                      fd_set *write_fd_set,
-                      fd_set *except_fd_set,
-                      MHD_socket *max_fd)
-MHD_NONNULL (1,2,3,4);
-
-
-/**
- * Obtain the `select()` sets for this daemon.  Daemon's FDs will be
- * added to fd_sets. To get only daemon FDs in fd_sets, call FD_ZERO
- * for each fd_set before calling this function.
- *
- * Passing custom FD_SETSIZE as @a fd_setsize allow usage of
- * larger/smaller than platform's default fd_sets.
- *
- * This function should only be called in when MHD is configured to
- * use external select with 'select()' or with 'epoll'.  In the latter
- * case, it will only add the single 'epoll' file descriptor used by
- * MHD to the sets.  It's necessary to use #MHD_get_timeout() in
- * combination with this function.
- *
- * This function must be called only for daemon started
- * without #MHD_USE_INTERNAL_POLLING_THREAD flag.
- *
- * @param daemon daemon to get sets from
- * @param read_fd_set read set
- * @param write_fd_set write set
- * @param except_fd_set except set
- * @param max_fd increased to largest FD added (if larger
- *               than existing value); can be NULL
- * @param fd_setsize value of FD_SETSIZE
- * @return #MHD_SC_OK on success, otherwise error code
- * @ingroup event
- */
-_MHD_EXTERN enum MHD_StatusCode
-MHD_daemon_get_fdset2 (struct MHD_Daemon *daemon,
-                       fd_set *read_fd_set,
-                       fd_set *write_fd_set,
-                       fd_set *except_fd_set,
-                       MHD_socket *max_fd,
-                       unsigned int fd_setsize)
-MHD_NONNULL (1,2,3,4);
-
-
-/**
- * Obtain the `select()` sets for this daemon.  Daemon's FDs will be
- * added to fd_sets. To get only daemon FDs in fd_sets, call FD_ZERO
- * for each fd_set before calling this function. Size of fd_set is
- * determined by current value of FD_SETSIZE.  It's necessary to use
- * #MHD_get_timeout() in combination with this function.
- *
- * This function could be called only for daemon started
- * without #MHD_USE_INTERNAL_POLLING_THREAD flag.
- *
- * @param daemon daemon to get sets from
- * @param read_fd_set read set
- * @param write_fd_set write set
- * @param except_fd_set except set
- * @param max_fd increased to largest FD added (if larger
- *               than existing value); can be NULL
- * @return #MHD_YES on success, #MHD_NO if this
- *         daemon was not started with the right
- *         options for this call or any FD didn't
- *         fit fd_set.
- * @ingroup event
- */
-#define MHD_daemon_get_fdset(daemon,read_fd_set,write_fd_set,except_fd_set, \
-                             max_fd) \
-  MHD_get_fdset2 ((daemon),(read_fd_set),(write_fd_set),(except_fd_set), \
-                  (max_fd),FD_SETSIZE)
-
-
-/**
- * Obtain timeout value for polling function for this daemon.
- * This function set value to amount of milliseconds for which polling
- * function (`select()` or `poll()`) should at most block, not the
- * timeout value set for connections.
- * It is important to always use this function, even if connection
- * timeout is not set, as in some cases MHD may already have more
- * data to process on next turn (data pending in TLS buffers,
- * connections are already ready with epoll etc.) and returned timeout
- * will be zero.
- *
- * @param daemon daemon to query for timeout
- * @param timeout set to the timeout (in milliseconds)
- * @return #MHD_SC_OK on success, #MHD_SC_NO_TIMEOUT if timeouts are
- *        not used (or no connections exist that would
- *        necessitate the use of a timeout right now), otherwise
- *        an error code
- * @ingroup event
- */
-_MHD_EXTERN enum MHD_StatusCode
-MHD_daemon_get_timeout (struct MHD_Daemon *daemon,
-                        MHD_UNSIGNED_LONG_LONG *timeout)
-MHD_NONNULL (1,2);
-
-
-/**
- * Run webserver operations (without blocking unless in client
- * callbacks).  This method should be called by clients in combination
- * with #MHD_get_fdset if the client-controlled select method is used
- * and #MHD_get_timeout().
- *
- * This function is a convenience method, which is useful if the
- * fd_sets from #MHD_get_fdset were not directly passed to `select()`;
- * with this function, MHD will internally do the appropriate `select()`
- * call itself again.  While it is always safe to call #MHD_run (if
- * #MHD_USE_INTERNAL_POLLING_THREAD is not set), you should call
- * #MHD_run_from_select if performance is important (as it saves an
- * expensive call to `select()`).
- *
- * @param daemon daemon to run
- * @return #MHD_SC_OK on success
- * @ingroup event
- */
-_MHD_EXTERN enum MHD_StatusCode
-MHD_daemon_run (struct MHD_Daemon *daemon)
-MHD_NONNULL (1);
-
-
-/**
- * Run webserver operations. This method should be called by clients
- * in combination with #MHD_get_fdset and #MHD_get_timeout() if the
- * client-controlled select method is used.
- *
- * You can use this function instead of #MHD_run if you called
- * `select()` on the result from #MHD_get_fdset.  File descriptors in
- * the sets that are not controlled by MHD will be ignored.  Calling
- * this function instead of #MHD_run is more efficient as MHD will not
- * have to call `select()` again to determine which operations are
- * ready.
- *
- * This function cannot be used with daemon started with
- * #MHD_USE_INTERNAL_POLLING_THREAD flag.
- *
- * @param daemon daemon to run select loop for
- * @param read_fd_set read set
- * @param write_fd_set write set
- * @param except_fd_set except set
- * @return #MHD_SC_OK on success
- * @ingroup event
- */
-_MHD_EXTERN enum MHD_StatusCode
-MHD_daemon_run_from_select (struct MHD_Daemon *daemon,
-                            const fd_set *read_fd_set,
-                            const fd_set *write_fd_set,
-                            const fd_set *except_fd_set)
-MHD_NONNULL (1,2,3,4);
-
-
-/* ********************* daemon options ************** */
-
-
-/**
- * Type of a callback function used for logging by MHD.
- *
- * @param cls closure
- * @param sc status code of the event
- * @param fm format string (`printf()`-style)
- * @param ap arguments to @a fm
- * @ingroup logging
- */
-typedef void
-(*MHD_LoggingCallback)(void *cls,
-                       enum MHD_StatusCode sc,
-                       const char *fm,
-                       va_list ap);
-
-
-/**
- * Set logging method.  Specify NULL to disable logging entirely.  By
- * default (if this option is not given), we log error messages to
- * stderr.
- *
- * @param daemon which instance to setup logging for
- * @param logger function to invoke
- * @param logger_cls closure for @a logger
- */
-_MHD_EXTERN void
-MHD_daemon_set_logger (struct MHD_Daemon *daemon,
-                       MHD_LoggingCallback logger,
-                       void *logger_cls)
-MHD_NONNULL (1);
-
-
-/**
- * Convenience macro used to disable logging.
- *
- * @param daemon which instance to disable logging for
- */
-#define MHD_daemon_disable_logging(daemon) MHD_daemon_set_logger (daemon, NULL, \
-                                                                  NULL)
-
-
-/**
- * Suppress use of "Date" header as this system has no RTC.
- *
- * @param daemon which instance to disable clock for.
- */
-_MHD_EXTERN void
-MHD_daemon_suppress_date_no_clock (struct MHD_Daemon *daemon)
-MHD_NONNULL (1);
-
-
-/**
- * Disable use of inter-thread communication channel.
- * #MHD_daemon_disable_itc() can be used with
- * #MHD_daemon_thread_internal() to perform some additional
- * optimizations (in particular, not creating a pipe for IPC
- * signalling).  If it is used, certain functions like
- * #MHD_daemon_quiesce() or #MHD_connection_add() or
- * #MHD_action_suspend() cannot be used anymore.
- * #MHD_daemon_disable_itc() is not beneficial on platforms where
- * select()/poll()/other signal shutdown() of a listen socket.
- *
- * You should only use this function if you are sure you do
- * satisfy all of its requirements and need a generally minor
- * boost in performance.
- *
- * @param daemon which instance to disable itc for
- */
-_MHD_EXTERN void
-MHD_daemon_disable_itc (struct MHD_Daemon *daemon)
-MHD_NONNULL (1);
-
-
-/**
- * Enable `turbo`.  Disables certain calls to `shutdown()`,
- * enables aggressive non-blocking optimistic reads and
- * other potentially unsafe optimizations.
- * Most effects only happen with #MHD_ELS_EPOLL.
- *
- * @param daemon which instance to enable turbo for
- */
-_MHD_EXTERN void
-MHD_daemon_enable_turbo (struct MHD_Daemon *daemon)
-MHD_NONNULL (1);
-
-
-/**
- * Disable #MHD_action_suspend() functionality.
- *
- * You should only use this function if you are sure you do
- * satisfy all of its requirements and need a generally minor
- * boost in performance.
- *
- * @param daemon which instance to disable suspend for
- */
-_MHD_EXTERN void
-MHD_daemon_disallow_suspend_resume (struct MHD_Daemon *daemon)
-MHD_NONNULL (1);
-
-
-/**
- * You need to set this option if you want to disable use of HTTP "Upgrade".
- * "Upgrade" may require usage of additional internal resources,
- * which we can avoid providing if they will not be used.
- *
- * You should only use this function if you are sure you do
- * satisfy all of its requirements and need a generally minor
- * boost in performance.
- *
- * @param daemon which instance to enable suspend/resume for
- */
-_MHD_EXTERN void
-MHD_daemon_disallow_upgrade (struct MHD_Daemon *daemon)
-MHD_NONNULL (1);
-
-
-/**
- * Possible levels of enforcement for TCP_FASTOPEN.
- */
-enum MHD_FastOpenMethod
-{
-  /**
-   * Disable use of TCP_FASTOPEN.
-   */
-  MHD_FOM_DISABLE = -1,
-
-  /**
-   * Enable TCP_FASTOPEN where supported (Linux with a kernel >= 3.6).
-   * This is the default.
-   */
-  MHD_FOM_AUTO = 0,
-
-  /**
-   * If TCP_FASTOPEN is not available, return #MHD_NO.
-   * Also causes #MHD_daemon_start() to fail if setting
-   * the option fails later.
-   */
-  MHD_FOM_REQUIRE = 1
-};
-
-
-/**
- * Configure TCP_FASTOPEN option, including setting a
- * custom @a queue_length.
- *
- * Note that having a larger queue size can cause resource exhaustion
- * attack as the TCP stack has to now allocate resources for the SYN
- * packet along with its DATA.
- *
- * @param daemon which instance to configure TCP_FASTOPEN for
- * @param fom under which conditions should we use TCP_FASTOPEN?
- * @param queue_length queue length to use, default is 50 if this
- *        option is never given.
- * @return #MHD_YES upon success, #MHD_NO if #MHD_FOM_REQUIRE was
- *         given, but TCP_FASTOPEN is not available on the platform
- */
-_MHD_EXTERN enum MHD_Bool
-MHD_daemon_tcp_fastopen (struct MHD_Daemon *daemon,
-                         enum MHD_FastOpenMethod fom,
-                         unsigned int queue_length)
-MHD_NONNULL (1);
-
-
-/**
- * Address family to be used by MHD.
- */
-enum MHD_AddressFamily
-{
-  /**
-   * Option not given, do not listen at all
-   * (unless listen socket or address specified by
-   * other means).
-   */
-  MHD_AF_NONE = 0,
-
-  /**
-   * Pick "best" available method automatically.
-   */
-  MHD_AF_AUTO,
-
-  /**
-   * Use IPv4.
-   */
-  MHD_AF_INET4,
-
-  /**
-   * Use IPv6.
-   */
-  MHD_AF_INET6,
-
-  /**
-   * Use dual stack.
-   */
-  MHD_AF_DUAL
-};
-
-
-/**
- * Bind to the given TCP port and address family.
- *
- * Ineffective in conjunction with #MHD_daemon_listen_socket().
- * Ineffective in conjunction with #MHD_daemon_bind_sa().
- *
- * If neither this option nor the other two mentioned above
- * is specified, MHD will simply not listen on any socket!
- *
- * @param daemon which instance to configure the TCP port for
- * @param af address family to use
- * @param port port to use, 0 to bind to a random (free) port
- */
-_MHD_EXTERN void
-MHD_daemon_bind_port (struct MHD_Daemon *daemon,
-                      enum MHD_AddressFamily af,
-                      uint16_t port)
-MHD_NONNULL (1);
-
-
-/**
- * Bind to the given socket address.
- * Ineffective in conjunction with #MHD_daemon_listen_socket().
- *
- * @param daemon which instance to configure the binding address for
- * @param sa address to bind to; can be IPv4 (AF_INET), IPv6 (AF_INET6)
- *        or even a UNIX domain socket (AF_UNIX)
- * @param sa_len number of bytes in @a sa
- */
-_MHD_EXTERN void
-MHD_daemon_bind_socket_address (struct MHD_Daemon *daemon,
-                                const struct sockaddr *sa,
-                                size_t sa_len)
-MHD_NONNULL (1);
-
-
-/**
- * Use the given backlog for the listen() call.
- * Ineffective in conjunction with #MHD_daemon_listen_socket().
- *
- * @param daemon which instance to configure the backlog for
- * @param listen_backlog backlog to use
- */
-_MHD_EXTERN void
-MHD_daemon_listen_backlog (struct MHD_Daemon *daemon,
-                           int listen_backlog)
-MHD_NONNULL (1);
-
-
-/**
- * If present true, allow reusing address:port socket (by using
- * SO_REUSEPORT on most platform, or platform-specific ways).  If
- * present and set to false, disallow reusing address:port socket
- * (does nothing on most platform, but uses SO_EXCLUSIVEADDRUSE on
- * Windows).
- * Ineffective in conjunction with #MHD_daemon_listen_socket().
- *
- * @param daemon daemon to configure address reuse for
- */
-_MHD_EXTERN void
-MHD_daemon_listen_allow_address_reuse (struct MHD_Daemon *daemon)
-MHD_NONNULL (1);
-
-
-/**
- * Accept connections from the given socket.  Socket
- * must be a TCP or UNIX domain (stream) socket.
- *
- * Unless -1 is given, this disables other listen options, including
- * #MHD_daemon_bind_sa(), #MHD_daemon_bind_port(),
- * #MHD_daemon_listen_queue() and
- * #MHD_daemon_listen_allow_address_reuse().
- *
- * @param daemon daemon to set listen socket for
- * @param listen_socket listen socket to use,
- *        MHD_INVALID_SOCKET value will cause this call to be
- *        ignored (other binding options may still be effective)
- */
-_MHD_EXTERN void
-MHD_daemon_listen_socket (struct MHD_Daemon *daemon,
-                          MHD_socket listen_socket)
-MHD_NONNULL (1);
-
-
-/**
- * Event loop syscalls supported by MHD.
- */
-enum MHD_EventLoopSyscall
-{
-  /**
-   * Automatic selection of best-available method. This is also the
-   * default.
-   */
-  MHD_ELS_AUTO = 0,
-
-  /**
-   * Use select().
-   */
-  MHD_ELS_SELECT = 1,
-
-  /**
-   * Use poll().
-   */
-  MHD_ELS_POLL = 2,
-
-  /**
-   * Use epoll().
-   */
-  MHD_ELS_EPOLL = 3
-};
-
-
-/**
- * Force use of a particular event loop system call.
- *
- * @param daemon daemon to set event loop style for
- * @param els event loop syscall to use
- * @return #MHD_NO on failure, #MHD_YES on success
- */
-_MHD_EXTERN enum MHD_Bool
-MHD_daemon_event_loop (struct MHD_Daemon *daemon,
-                       enum MHD_EventLoopSyscall els)
-MHD_NONNULL (1);
-
-
-/**
- * Protocol strictness enforced by MHD on clients.
- */
-enum MHD_ProtocolStrictLevel
-{
-  /**
-   * Be particularly permissive about the protocol, allowing slight
-   * deviations that are technically not allowed by the
-   * RFC. Specifically, at the moment, this flag causes MHD to allow
-   * spaces in header field names. This is disallowed by the standard.
-   * It is not recommended to set this value on publicly available
-   * servers as it may potentially lower level of protection.
-   */
-  MHD_PSL_PERMISSIVE = -1,
-
-  /**
-   * Sane level of protocol enforcement for production use.
-   */
-  MHD_PSL_DEFAULT = 0,
-
-  /**
-   * Be strict about the protocol (as opposed to as tolerant as
-   * possible).  Specifically, at the moment, this flag causes MHD to
-   * reject HTTP 1.1 connections without a "Host" header.  This is
-   * required by the standard, but of course in violation of the "be
-   * as liberal as possible in what you accept" norm.  It is
-   * recommended to set this if you are testing clients against
-   * MHD, and to use default in production.
-   */
-  MHD_PSL_STRICT = 1
-};
-
-
-/**
- * Set how strictly MHD will enforce the HTTP protocol.
- *
- * @param daemon daemon to configure strictness for
- * @param sl how strict should we be
- */
-_MHD_EXTERN void
-MHD_daemon_protocol_strict_level (struct MHD_Daemon *daemon,
-                                  enum MHD_ProtocolStrictLevel sl)
-MHD_NONNULL (1);
-
-
-/**
- * Use SHOUTcast.  This will cause the response to begin
- * with the SHOUTcast "ICY" line instead of "HTTP".
- *
- * @param daemon daemon to set SHOUTcast option for
- */
-_MHD_EXTERN void
-MHD_daemon_enable_shoutcast (struct MHD_Daemon *daemon)
-MHD_NONNULL (1);
-
-
-/**
- * Enable and configure TLS.
- *
- * @param daemon which instance should be configured
- * @param tls_backend which TLS backend should be used,
- *    currently only "gnutls" is supported.  You can
- *    also specify NULL for best-available (which is the default).
- * @param ciphers which ciphers should be used by TLS, default is
- *     "NORMAL"
- * @return status code, #MHD_SC_OK upon success
- *     #MHD_TLS_BACKEND_UNSUPPORTED if the @a backend is unknown
- *     #MHD_TLS_DISABLED if this build of MHD does not support TLS
- *     #MHD_TLS_CIPHERS_INVALID if the given @a ciphers are not supported
- *     by this backend
- */
-_MHD_EXTERN enum MHD_StatusCode
-MHD_daemon_set_tls_backend (struct MHD_Daemon *daemon,
-                            const char *tls_backend,
-                            const char *ciphers)
-MHD_NONNULL (1);
-
-
-/**
- * Provide TLS key and certificate data in-memory.
- *
- * @param daemon which instance should be configured
- * @param mem_key private key (key.pem) to be used by the
- *     HTTPS daemon.  Must be the actual data in-memory, not a filename.
- * @param mem_cert certificate (cert.pem) to be used by the
- *     HTTPS daemon.  Must be the actual data in-memory, not a filename.
- * @param pass passphrase phrase to decrypt 'key.pem', NULL
- *     if @param mem_key is in cleartext already
- * @return #MHD_SC_OK upon success; TODO: define failure modes
- */
-_MHD_EXTERN enum MHD_StatusCode
-MHD_daemon_tls_key_and_cert_from_memory (struct MHD_Daemon *daemon,
-                                         const char *mem_key,
-                                         const char *mem_cert,
-                                         const char *pass)
-MHD_NONNULL (1,2,3);
-
-
-/**
- * Configure DH parameters (dh.pem) to use for the TLS key
- * exchange.
- *
- * @param daemon daemon to configure tls for
- * @param dh parameters to use
- * @return #MHD_SC_OK upon success; TODO: define failure modes
- */
-_MHD_EXTERN enum MHD_StatusCode
-MHD_daemon_tls_mem_dhparams (struct MHD_Daemon *daemon,
-                             const char *dh)
-MHD_NONNULL (1);
-
-
-/**
- * Function called to lookup the pre shared key (@a psk) for a given
- * HTTP connection based on the @a username.
- *
- * @param cls closure
- * @param connection the HTTPS connection
- * @param username the user name claimed by the other side
- * @param[out] psk to be set to the pre-shared-key; should be allocated with malloc(),
- *                 will be freed by MHD
- * @param[out] psk_size to be set to the number of bytes in @a psk
- * @return 0 on success, -1 on errors
- */
-typedef int
-(*MHD_PskServerCredentialsCallback)(void *cls,
-                                    const struct MHD_Connection *connection,
-                                    const char *username,
-                                    void **psk,
-                                    size_t *psk_size);
-
-
-/**
- * Configure PSK to use for the TLS key exchange.
- *
- * @param daemon daemon to configure tls for
- * @param psk_cb function to call to obtain pre-shared key
- * @param psk_cb_cls closure for @a psk_cb
- * @return #MHD_SC_OK upon success; TODO: define failure modes
- */
-_MHD_EXTERN enum MHD_StatusCode
-MHD_daemon_set_tls_psk_callback (struct MHD_Daemon *daemon,
-                                 MHD_PskServerCredentialsCallback psk_cb,
-                                 void *psk_cb_cls)
-MHD_NONNULL (1);
-
-
-/**
- * Memory pointer for the certificate (ca.pem) to be used by the
- * HTTPS daemon for client authentication.
- *
- * @param daemon daemon to configure tls for
- * @param mem_trust memory pointer to the certificate
- * @return #MHD_SC_OK upon success; TODO: define failure modes
- */
-_MHD_EXTERN enum MHD_StatusCode
-MHD_daemon_tls_mem_trust (struct MHD_Daemon *daemon,
-                          const char *mem_trust)
-MHD_NONNULL (1);
-
-
-/**
- * Configure daemon credentials type for GnuTLS.
- *
- * @param gnutls_credentials must be a value of
- *   type `gnutls_credentials_type_t`
- * @return #MHD_SC_OK upon success; TODO: define failure modes
- */
-_MHD_EXTERN enum MHD_StatusCode
-MHD_daemon_gnutls_credentials (struct MHD_Daemon *daemon,
-                               int gnutls_credentials)
-MHD_NONNULL (1);
-
-
-/**
- * Provide TLS key and certificate data via callback.
- *
- * Use a callback to determine which X.509 certificate should be used
- * for a given HTTPS connection.  This option provides an alternative
- * to #MHD_daemon_tls_key_and_cert_from_memory().  You must use this
- * version if multiple domains are to be hosted at the same IP address
- * using TLS's Server Name Indication (SNI) extension.  In this case,
- * the callback is expected to select the correct certificate based on
- * the SNI information provided.  The callback is expected to access
- * the SNI data using `gnutls_server_name_get()`.  Using this option
- * requires GnuTLS 3.0 or higher.
- *
- * @param daemon daemon to configure callback for
- * @param cb must be of type `gnutls_certificate_retrieve_function2 *`.
- * @return #MHD_SC_OK on success
- */
-_MHD_EXTERN enum MHD_StatusCode
-MHD_daemon_gnutls_key_and_cert_from_callback (struct MHD_Daemon *daemon,
-                                              void *cb)
-MHD_NONNULL (1);
-
-
-/**
- * Which threading mode should be used by MHD?
- */
-enum MHD_ThreadingMode
-{
-
-  /**
-   * MHD should create its own thread for listening and furthermore
-   * create another thread per connection to handle requests.  Use
-   * this if handling requests is CPU-intensive or blocking, your
-   * application is thread-safe and you have plenty of memory (per
-   * request).
-   */
-  MHD_TM_THREAD_PER_CONNECTION = -1,
-
-  /**
-   * Use an external event loop. This is the default.
-   */
-  MHD_TM_EXTERNAL_EVENT_LOOP = 0,
-
-  /**
-   * Run with one or more worker threads.  Any positive value
-   * means that MHD should start that number of worker threads
-   * (so > 1 is a thread pool) and distributed processing of
-   * requests among the workers.
-   *
-   * A good way to express the use of a thread pool
-   * in your code would be to write "MHD_TM_THREAD_POOL(4)"
-   * to indicate four threads.
-   *
-   * If a positive value is set, * #MHD_daemon_run() and
-   * #MHD_daemon_run_from_select() cannot be used.
-   */
-  MHD_TM_WORKER_THREADS = 1
-
-};
-
-
-/**
- * Use a thread pool of size @a n.
- *
- * @return an `enum MHD_ThreadingMode` for a thread pool of size @a n
- */
-#define MHD_TM_THREAD_POOL(n) ((enum MHD_ThreadingMode) (n))
-
-
-/**
- * Specify threading mode to use.
- *
- * @param daemon daemon to configure
- * @param tm mode to use (positive values indicate the
- *        number of worker threads to be used)
- */
-_MHD_EXTERN void
-MHD_daemon_threading_mode (struct MHD_Daemon *daemon,
-                           enum MHD_ThreadingMode tm)
-MHD_NONNULL (1);
-
-
-/**
- * Allow or deny a client to connect.
- *
- * @param cls closure
- * @param addr address information from the client
- * @param addrlen length of @a addr
- * @see #MHD_daemon_accept_policy()
- * @return #MHD_YES if connection is allowed, #MHD_NO if not
- */
-typedef enum MHD_Bool
-(*MHD_AcceptPolicyCallback)(void *cls,
-                            const struct sockaddr *addr,
-                            size_t addrlen);
-
-
-/**
- * Set  a policy callback that accepts/rejects connections
- * based on the client's IP address.  This function will be called
- * before a connection object is created.
- *
- * @param daemon daemon to set policy for
- * @param apc function to call to check the policy
- * @param apc_cls closure for @a apc
- */
-_MHD_EXTERN void
-MHD_daemon_accept_policy (struct MHD_Daemon *daemon,
-                          MHD_AcceptPolicyCallback apc,
-                          void *apc_cls)
-MHD_NONNULL (1);
-
-
-/**
- * Function called by MHD to allow the application to log
- * the full @a uri of a @a request.
- *
- * @param cls client-defined closure
- * @param uri the full URI from the HTTP request
- * @param request the HTTP request handle (headers are
- *         not yet available)
- * @return value to set for the "request_context" of @a request
- */
-typedef void *
-(*MHD_EarlyUriLogCallback)(void *cls,
-                           const char *uri,
-                           struct MHD_Request *request);
-
-
-/**
- * Register a callback to be called first for every request
- * (before any parsing of the header).  Makes it easy to
- * log the full URL.
- *
- * @param daemon daemon for which to set the logger
- * @param cb function to call
- * @param cb_cls closure for @a cb
- */
-_MHD_EXTERN void
-MHD_daemon_set_early_uri_logger (struct MHD_Daemon *daemon,
-                                 MHD_EarlyUriLogCallback cb,
-                                 void *cb_cls)
-MHD_NONNULL (1);
-
-
-/**
- * The `enum MHD_ConnectionNotificationCode` specifies types
- * of connection notifications.
- * @ingroup request
- */
-enum MHD_ConnectionNotificationCode
-{
-
-  /**
-   * A new connection has been started.
-   * @ingroup request
-   */
-  MHD_CONNECTION_NOTIFY_STARTED = 0,
-
-  /**
-   * A connection is closed.
-   * @ingroup request
-   */
-  MHD_CONNECTION_NOTIFY_CLOSED = 1
-
-};
-
-
-/**
- * Signature of the callback used by MHD to notify the
- * application about started/stopped connections
- *
- * @param cls client-defined closure
- * @param connection connection handle
- * @param socket_context socket-specific pointer where the
- *                       client can associate some state specific
- *                       to the TCP connection; note that this is
- *                       different from the "req_cls" which is per
- *                       HTTP request.  The client can initialize
- *                       during #MHD_CONNECTION_NOTIFY_STARTED and
- *                       cleanup during #MHD_CONNECTION_NOTIFY_CLOSED
- *                       and access in the meantime using
- *                       #MHD_CONNECTION_INFO_SOCKET_CONTEXT.
- * @param toe reason for connection notification
- * @see #MHD_OPTION_NOTIFY_CONNECTION
- * @ingroup request
- */
-typedef void
-(*MHD_NotifyConnectionCallback) (void *cls,
-                                 struct MHD_Connection *connection,
-                                 enum MHD_ConnectionNotificationCode toe);
-
-
-/**
- * Register a function that should be called whenever a connection is
- * started or closed.
- *
- * @param daemon daemon to set callback for
- * @param ncc function to call to check the policy
- * @param ncc_cls closure for @a apc
- */
-_MHD_EXTERN void
-MHD_daemon_set_notify_connection (struct MHD_Daemon *daemon,
-                                  MHD_NotifyConnectionCallback ncc,
-                                  void *ncc_cls)
-MHD_NONNULL (1);
-
-
-/**
- * Maximum memory size per connection.
- * Default is 32 kb (#MHD_POOL_SIZE_DEFAULT).
- * Values above 128k are unlikely to result in much benefit, as half
- * of the memory will be typically used for IO, and TCP buffers are
- * unlikely to support window sizes above 64k on most systems.
- *
- * @param daemon daemon to configure
- * @param memory_limit_b connection memory limit to use in bytes
- * @param memory_increment_b increment to use when growing the read buffer, must be smaller than @a memory_limit_b
- */
-_MHD_EXTERN void
-MHD_daemon_connection_memory_limit (struct MHD_Daemon *daemon,
-                                    size_t memory_limit_b,
-                                    size_t memory_increment_b)
-MHD_NONNULL (1);
-
-
-/**
- * Desired size of the stack for threads created by MHD.  Use 0 for
- * system default.  Only useful if the selected threading mode
- * is not #MHD_TM_EXTERNAL_EVENT_LOOP.
- *
- * @param daemon daemon to configure
- * @param stack_limit_b stack size to use in bytes
- */
-_MHD_EXTERN void
-MHD_daemon_thread_stack_size (struct MHD_Daemon *daemon,
-                              size_t stack_limit_b)
-MHD_NONNULL (1);
-
-
-/**
- * Set maximum number of concurrent connections to accept.  If not
- * given, MHD will not enforce any limits (modulo running into
- * OS limits).  Values of 0 mean no limit.
- *
- * @param daemon daemon to configure
- * @param global_connection_limit maximum number of (concurrent)
-          connections
- * @param ip_connection_limit limit on the number of (concurrent)
- *        connections made to the server from the same IP address.
- *        Can be used to prevent one IP from taking over all of
- *        the allowed connections.  If the same IP tries to
- *        establish more than the specified number of
- *        connections, they will be immediately rejected.
- */
-_MHD_EXTERN void
-MHD_daemon_connection_limits (struct MHD_Daemon *daemon,
-                              unsigned int global_connection_limit,
-                              unsigned int ip_connection_limit)
-MHD_NONNULL (1);
-
-
-/**
- * After how many seconds of inactivity should a
- * connection automatically be timed out?
- * Use zero for no timeout, which is also the (unsafe!) default.
- *
- * @param daemon daemon to configure
- * @param timeout_s number of seconds of timeout to use
- */
-_MHD_EXTERN void
-MHD_daemon_connection_default_timeout (struct MHD_Daemon *daemon,
-                                       unsigned int timeout_s)
-MHD_NONNULL (1);
-
-
-/**
- * Signature of functions performing unescaping of strings.
- * The return value must be "strlen(s)" and @a s  should be
- * updated.  Note that the unescape function must not lengthen @a s
- * (the result must be shorter than the input and still be
- * 0-terminated).
- *
- * @param cls closure
- * @param req the request for which unescaping is performed
- * @param[in,out] s string to unescape
- * @return number of characters in @a s (excluding 0-terminator)
- */
-typedef size_t
-(*MHD_UnescapeCallback) (void *cls,
-                         struct MHD_Request *req,
-                         char *s);
-
-
-/**
- * Specify a function that should be called for unescaping escape
- * sequences in URIs and URI arguments.  Note that this function
- * will NOT be used by the `struct MHD_PostProcessor`.  If this
- * option is not specified, the default method will be used which
- * decodes escape sequences of the form "%HH".
- *
- * @param daemon daemon to configure
- * @param unescape_cb function to use, NULL for default
- * @param unescape_cb_cls closure for @a unescape_cb
- */
-_MHD_EXTERN void
-MHD_daemon_unescape_cb (struct MHD_Daemon *daemon,
-                        MHD_UnescapeCallback unescape_cb,
-                        void *unescape_cb_cls)
-MHD_NONNULL (1);
-
-
-/**
- * Set random values to be used by the Digest Auth module.  Note that
- * the application must ensure that @a buf remains allocated and
- * unmodified while the daemon is running.
- *
- * @param daemon daemon to configure
- * @param buf_size number of bytes in @a buf
- * @param buf entropy buffer
- */
-_MHD_EXTERN void
-MHD_daemon_digest_auth_random (struct MHD_Daemon *daemon,
-                               size_t buf_size,
-                               const void *buf)
-MHD_NONNULL (1,3);
-
-
-/**
- * Length of the internal array holding the map of the nonce and
- * the nonce counter.
- *
- * @param daemon daemon to configure
- * @param nc_length desired array length
- */
-_MHD_EXTERN enum MHD_StatusCode
-MHD_daemon_digest_auth_nc_length (struct MHD_Daemon *daemon,
-                                  size_t nc_length)
-MHD_NONNULL (1);
-
-
-/* ********************* connection options ************** */
-
-
-/**
- * Set custom timeout for the given connection.
- * Specified as the number of seconds.  Use zero for no timeout.
- * Calling this function will reset timeout timer.
- *
- * @param connection connection to configure timeout for
- * @param timeout_s new timeout in seconds
- */
-_MHD_EXTERN void
-MHD_connection_set_timeout (struct MHD_Connection *connection,
-                            unsigned int timeout_s)
-MHD_NONNULL (1);
-
-
-/* **************** Request handling functions ***************** */
-
-
-/**
- * The `enum MHD_ValueKind` specifies the source of
- * the key-value pairs in the HTTP protocol.
- */
-enum MHD_ValueKind
-{
-
-  /**
-   * HTTP header (request/response).
-   */
-  MHD_HEADER_KIND = 1,
-
-  /**
-   * Cookies.  Note that the original HTTP header containing
-   * the cookie(s) will still be available and intact.
-   */
-  MHD_COOKIE_KIND = 2,
-
-  /**
-   * POST data.  This is available only if a content encoding
-   * supported by MHD is used (currently only URL encoding),
-   * and only if the posted content fits within the available
-   * memory pool.  Note that in that case, the upload data
-   * given to the #MHD_AccessHandlerCallback will be
-   * empty (since it has already been processed).
-   */
-  MHD_POSTDATA_KIND = 4,
-
-  /**
-   * GET (URI) arguments.
-   */
-  MHD_GET_ARGUMENT_KIND = 8,
-
-  /**
-   * HTTP footer (only for HTTP 1.1 chunked encodings).
-   */
-  MHD_FOOTER_KIND = 16
-};
-
-
-/**
- * Iterator over key-value pairs.  This iterator can be used to
- * iterate over all of the cookies, headers, or POST-data fields of a
- * request, and also to iterate over the headers that have been added
- * to a response.
- *
- * @param cls closure
- * @param kind kind of the header we are looking at
- * @param key key for the value, can be an empty string
- * @param value corresponding value, can be NULL
- * @return #MHD_YES to continue iterating,
- *         #MHD_NO to abort the iteration
- * @ingroup request
- */
-typedef int
-(*MHD_KeyValueIterator) (void *cls,
-                         enum MHD_ValueKind kind,
-                         const char *key,
-                         const char *value);
-
-
-/**
- * Get all of the headers from the request.
- *
- * @param request request to get values from
- * @param kind types of values to iterate over, can be a bitmask
- * @param iterator callback to call on each header;
- *        maybe NULL (then just count headers)
- * @param iterator_cls extra argument to @a iterator
- * @return number of entries iterated over
- * @ingroup request
- */
-_MHD_EXTERN unsigned int
-MHD_request_get_values (struct MHD_Request *request,
-                        enum MHD_ValueKind kind,
-                        MHD_KeyValueIterator iterator,
-                        void *iterator_cls)
-MHD_NONNULL (1);
-
-
-/**
- * This function can be used to add an entry to the HTTP headers of a
- * request (so that the #MHD_request_get_values function will
- * return them -- and the `struct MHD_PostProcessor` will also see
- * them).  This maybe required in certain situations (see Mantis
- * #1399) where (broken) HTTP implementations fail to supply values
- * needed by the post processor (or other parts of the application).
- *
- * This function MUST only be called from within the
- * request callbacks (otherwise, access maybe improperly
- * synchronized).  Furthermore, the client must guarantee that the key
- * and value arguments are 0-terminated strings that are NOT freed
- * until the connection is closed.  (The easiest way to do this is by
- * passing only arguments to permanently allocated strings.).
- *
- * @param request the request for which a
- *  value should be set
- * @param kind kind of the value
- * @param key key for the value
- * @param value the value itself
- * @return #MHD_NO if the operation could not be
- *         performed due to insufficient memory;
- *         #MHD_YES on success
- * @ingroup request
- */
-_MHD_EXTERN enum MHD_Bool
-MHD_request_set_value (struct MHD_Request *request,
-                       enum MHD_ValueKind kind,
-                       const char *key,
-                       const char *value)
-MHD_NONNULL (1,3,4);
-
-
-/**
- * Get a particular header value.  If multiple
- * values match the kind, return any one of them.
- *
- * @param request request to get values from
- * @param kind what kind of value are we looking for
- * @param key the header to look for, NULL to lookup 'trailing' value without a key
- * @return NULL if no such item was found
- * @ingroup request
- */
-_MHD_EXTERN const char *
-MHD_request_lookup_value (struct MHD_Request *request,
-                          enum MHD_ValueKind kind,
-                          const char *key)
-MHD_NONNULL (1);
-
-
-/**
- * @defgroup httpcode HTTP response codes.
- * These are the status codes defined for HTTP responses.
- * @{
- */
-/* See http://www.iana.org/assignments/http-status-codes/http-status-codes.xhtml */
-enum MHD_HTTP_StatusCode
-{
-  MHD_HTTP_CONTINUE = 100,
-  MHD_HTTP_SWITCHING_PROTOCOLS = 101,
-  MHD_HTTP_PROCESSING = 102,
-
-  MHD_HTTP_OK = 200,
-  MHD_HTTP_CREATED = 201,
-  MHD_HTTP_ACCEPTED = 202,
-  MHD_HTTP_NON_AUTHORITATIVE_INFORMATION = 203,
-  MHD_HTTP_NO_CONTENT = 204,
-  MHD_HTTP_RESET_CONTENT = 205,
-  MHD_HTTP_PARTIAL_CONTENT = 206,
-  MHD_HTTP_MULTI_STATUS = 207,
-  MHD_HTTP_ALREADY_REPORTED = 208,
-
-  MHD_HTTP_IM_USED = 226,
-
-  MHD_HTTP_MULTIPLE_CHOICES = 300,
-  MHD_HTTP_MOVED_PERMANENTLY = 301,
-  MHD_HTTP_FOUND = 302,
-  MHD_HTTP_SEE_OTHER = 303,
-  MHD_HTTP_NOT_MODIFIED = 304,
-  MHD_HTTP_USE_PROXY = 305,
-  MHD_HTTP_SWITCH_PROXY = 306, /* IANA: unused */
-  MHD_HTTP_TEMPORARY_REDIRECT = 307,
-  MHD_HTTP_PERMANENT_REDIRECT = 308,
-
-  MHD_HTTP_BAD_REQUEST = 400,
-  MHD_HTTP_UNAUTHORIZED = 401,
-  MHD_HTTP_PAYMENT_REQUIRED = 402,
-  MHD_HTTP_FORBIDDEN = 403,
-  MHD_HTTP_NOT_FOUND = 404,
-  MHD_HTTP_METHOD_NOT_ALLOWED = 405,
-  MHD_HTTP_NOT_ACCEPTABLE = 406,
-/** @deprecated */
-#define MHD_HTTP_METHOD_NOT_ACCEPTABLE \
-  _MHD_DEPR_IN_MACRO ( \
-    "Value MHD_HTTP_METHOD_NOT_ACCEPTABLE is deprecated, use MHD_HTTP_NOT_ACCEPTABLE") \
-  MHD_HTTP_NOT_ACCEPTABLE
-  MHD_HTTP_PROXY_AUTHENTICATION_REQUIRED = 407,
-  MHD_HTTP_REQUEST_TIMEOUT = 408,
-  MHD_HTTP_CONFLICT = 409,
-  MHD_HTTP_GONE = 410,
-  MHD_HTTP_LENGTH_REQUIRED = 411,
-  MHD_HTTP_PRECONDITION_FAILED = 412,
-  MHD_HTTP_PAYLOAD_TOO_LARGE = 413,
-/** @deprecated */
-#define MHD_HTTP_REQUEST_ENTITY_TOO_LARGE \
-  _MHD_DEPR_IN_MACRO ( \
-    "Value MHD_HTTP_REQUEST_ENTITY_TOO_LARGE is deprecated, use MHD_HTTP_PAYLOAD_TOO_LARGE") \
-  MHD_HTTP_PAYLOAD_TOO_LARGE
-  MHD_HTTP_URI_TOO_LONG = 414,
-/** @deprecated */
-#define MHD_HTTP_REQUEST_URI_TOO_LONG \
-  _MHD_DEPR_IN_MACRO ( \
-    "Value MHD_HTTP_REQUEST_URI_TOO_LONG is deprecated, use MHD_HTTP_URI_TOO_LONG") \
-  MHD_HTTP_URI_TOO_LONG
-  MHD_HTTP_UNSUPPORTED_MEDIA_TYPE = 415,
-  MHD_HTTP_RANGE_NOT_SATISFIABLE = 416,
-/** @deprecated */
-#define MHD_HTTP_REQUESTED_RANGE_NOT_SATISFIABLE \
-  _MHD_DEPR_IN_MACRO ( \
-    "Value MHD_HTTP_REQUESTED_RANGE_NOT_SATISFIABLE is deprecated, use MHD_HTTP_RANGE_NOT_SATISFIABLE") \
-  MHD_HTTP_RANGE_NOT_SATISFIABLE
-  MHD_HTTP_EXPECTATION_FAILED = 417,
-
-  MHD_HTTP_MISDIRECTED_REQUEST = 421,
-  MHD_HTTP_UNPROCESSABLE_ENTITY = 422,
-  MHD_HTTP_LOCKED = 423,
-  MHD_HTTP_FAILED_DEPENDENCY = 424,
-  MHD_HTTP_UNORDERED_COLLECTION = 425, /* IANA: unused */
-  MHD_HTTP_UPGRADE_REQUIRED = 426,
-
-  MHD_HTTP_PRECONDITION_REQUIRED = 428,
-  MHD_HTTP_TOO_MANY_REQUESTS = 429,
-  MHD_HTTP_REQUEST_HEADER_FIELDS_TOO_LARGE = 431,
-
-  MHD_HTTP_NO_RESPONSE = 444, /* IANA: unused */
-
-  MHD_HTTP_RETRY_WITH = 449, /* IANA: unused */
-  MHD_HTTP_BLOCKED_BY_WINDOWS_PARENTAL_CONTROLS = 450,  /* IANA: unused */
-  MHD_HTTP_UNAVAILABLE_FOR_LEGAL_REASONS = 451,
-
-  MHD_HTTP_INTERNAL_SERVER_ERROR = 500,
-  MHD_HTTP_NOT_IMPLEMENTED = 501,
-  MHD_HTTP_BAD_GATEWAY = 502,
-  MHD_HTTP_SERVICE_UNAVAILABLE = 503,
-  MHD_HTTP_GATEWAY_TIMEOUT = 504,
-  MHD_HTTP_HTTP_VERSION_NOT_SUPPORTED = 505,
-  MHD_HTTP_VARIANT_ALSO_NEGOTIATES = 506,
-  MHD_HTTP_INSUFFICIENT_STORAGE = 507,
-  MHD_HTTP_LOOP_DETECTED = 508,
-  MHD_HTTP_BANDWIDTH_LIMIT_EXCEEDED = 509,  /* IANA: unused */
-  MHD_HTTP_NOT_EXTENDED = 510,
-  MHD_HTTP_NETWORK_AUTHENTICATION_REQUIRED = 511
-
-};
-
-
-/**
- * Returns the string reason phrase for a response code.
- *
- * If we don't have a string for a status code, we give the first
- * message in that status code class.
- */
-_MHD_EXTERN const char *
-MHD_get_reason_phrase_for (enum MHD_HTTP_StatusCode code);
-
-/** @} */ /* end of group httpcode */
-
-
-/**
- * @defgroup versions HTTP versions
- * These strings should be used to match against the first line of the
- * HTTP header.
- * @{
- */
-#define MHD_HTTP_VERSION_1_0 "HTTP/1.0"
-#define MHD_HTTP_VERSION_1_1 "HTTP/1.1"
-
-/** @} */ /* end of group versions */
-
-
-/**
- * Suspend handling of network data for a given request.  This can
- * be used to dequeue a request from MHD's event loop for a while.
- *
- * If you use this API in conjunction with a internal select or a
- * thread pool, you must set the option #MHD_USE_ITC to
- * ensure that a resumed request is immediately processed by MHD.
- *
- * Suspended requests continue to count against the total number of
- * requests allowed (per daemon, as well as per IP, if such limits
- * are set).  Suspended requests will NOT time out; timeouts will
- * restart when the request handling is resumed.  While a
- * request is suspended, MHD will not detect disconnects by the
- * client.
- *
- * The only safe time to suspend a request is from either a
- * #MHD_RequestHeaderCallback, #MHD_UploadCallback, or a
- * #MHD_RequestfetchResponseCallback.  Suspending a request
- * at any other time will cause an assertion failure.
- *
- * Finally, it is an API violation to call #MHD_daemon_stop() while
- * having suspended requests (this will at least create memory and
- * socket leaks or lead to undefined behavior).  You must explicitly
- * resume all requests before stopping the daemon.
- *
- * @return action to cause a request to be suspended.
- */
-_MHD_EXTERN const struct MHD_Action *
-MHD_action_suspend (void);
-
-
-/**
- * Resume handling of network data for suspended request.  It is
- * safe to resume a suspended request at any time.  Calling this
- * function on a request that was not previously suspended will
- * result in undefined behavior.
- *
- * If you are using this function in ``external'' select mode, you must
- * make sure to run #MHD_run() afterwards (before again calling
- * #MHD_get_fdset(), as otherwise the change may not be reflected in
- * the set returned by #MHD_get_fdset() and you may end up with a
- * request that is stuck until the next network activity.
- *
- * @param request the request to resume
- */
-_MHD_EXTERN void
-MHD_request_resume (struct MHD_Request *request)
-MHD_NONNULL (1);
-
-
-/* **************** Response manipulation functions ***************** */
-
-
-/**
- * Data transmitted in response to an HTTP request.
- * Usually the final action taken in response to
- * receiving a request.
- */
-struct MHD_Response;
-
-
-/**
- * Converts a @a response to an action.  If @a destroy_after_use
- * is set, the reference to the @a response is consumed
- * by the conversion. If @a consume is #MHD_NO, then
- * the @a response can be converted to actions in the future.
- * However, the @a response is frozen by this step and
- * must no longer be modified (i.e. by setting headers).
- *
- * @param response response to convert, not NULL
- * @param destroy_after_use should the response object be consumed?
- * @return corresponding action, never returns NULL
- *
- * Implementation note: internally, this is largely just
- * a cast (and possibly an RC increment operation),
- * as a response *is* an action.  As no memory is
- * allocated, this operation cannot fail.
- */
-_MHD_EXTERN const struct MHD_Action *
-MHD_action_from_response (struct MHD_Response *response,
-                          enum MHD_Bool destroy_after_use)
-MHD_NONNULL (1);
-
-
-/**
- * Only respond in conservative HTTP 1.0-mode.  In
- * particular, do not (automatically) sent "Connection" headers and
- * always close the connection after generating the response.
- *
- * @param request the request for which we force HTTP 1.0 to be used
- */
-_MHD_EXTERN void
-MHD_response_option_v10_only (struct MHD_Response *response)
-MHD_NONNULL (1);
-
-
-/**
- * The `enum MHD_RequestTerminationCode` specifies reasons
- * why a request has been terminated (or completed).
- * @ingroup request
- */
-enum MHD_RequestTerminationCode
-{
-
-  /**
-   * We finished sending the response.
-   * @ingroup request
-   */
-  MHD_REQUEST_TERMINATED_COMPLETED_OK = 0,
-
-  /**
-   * Error handling the connection (resources
-   * exhausted, other side closed connection,
-   * application error accepting request, etc.)
-   * @ingroup request
-   */
-  MHD_REQUEST_TERMINATED_WITH_ERROR = 1,
-
-  /**
-   * No activity on the connection for the number
-   * of seconds specified using
-   * #MHD_OPTION_CONNECTION_TIMEOUT.
-   * @ingroup request
-   */
-  MHD_REQUEST_TERMINATED_TIMEOUT_REACHED = 2,
-
-  /**
-   * We had to close the session since MHD was being
-   * shut down.
-   * @ingroup request
-   */
-  MHD_REQUEST_TERMINATED_DAEMON_SHUTDOWN = 3,
-
-  /**
-   * We tried to read additional data, but the other side closed the
-   * connection.  This error is similar to
-   * #MHD_REQUEST_TERMINATED_WITH_ERROR, but specific to the case where
-   * the connection died because the other side did not send expected
-   * data.
-   * @ingroup request
-   */
-  MHD_REQUEST_TERMINATED_READ_ERROR = 4,
-
-  /**
-   * The client terminated the connection by closing the socket
-   * for writing (TCP half-closed); MHD aborted sending the
-   * response according to RFC 2616, section 8.1.4.
-   * @ingroup request
-   */
-  MHD_REQUEST_TERMINATED_CLIENT_ABORT = 5
-
-};
-
-
-/**
- * Signature of the callback used by MHD to notify the application
- * about completed requests.
- *
- * @param cls client-defined closure
- * @param toe reason for request termination
- * @param request_context request context value, as originally
- *         returned by the #MHD_EarlyUriLogCallback
- * @see #MHD_option_request_completion()
- * @ingroup request
- */
-typedef void
-(*MHD_RequestTerminationCallback) (void *cls,
-                                   enum MHD_RequestTerminationCode toe,
-                                   void *request_context);
-
-
-/**
- * Set a function to be called once MHD is finished with the
- * request.
- *
- * @param response which response to set the callback for
- * @param termination_cb function to call
- * @param termination_cb_cls closure for @e termination_cb
- */
-_MHD_EXTERN void
-MHD_response_option_termination_callback (struct MHD_Response *response,
-                                          MHD_RequestTerminationCallback
-                                          termination_cb,
-                                          void *termination_cb_cls)
-MHD_NONNULL (1);
-
-
-/**
- * Callback used by libmicrohttpd in order to obtain content.  The
- * callback is to copy at most @a max bytes of content into @a buf.  The
- * total number of bytes that has been placed into @a buf should be
- * returned.
- *
- * Note that returning zero will cause libmicrohttpd to try again.
- * Thus, returning zero should only be used in conjunction
- * with MHD_suspend_connection() to avoid busy waiting.
- *
- * @param cls extra argument to the callback
- * @param pos position in the datastream to access;
- *        note that if a `struct MHD_Response` object is re-used,
- *        it is possible for the same content reader to
- *        be queried multiple times for the same data;
- *        however, if a `struct MHD_Response` is not re-used,
- *        libmicrohttpd guarantees that "pos" will be
- *        the sum of all non-negative return values
- *        obtained from the content reader so far.
- * @param buf where to copy the data
- * @param max maximum number of bytes to copy to @a buf (size of @a buf)
- * @return number of bytes written to @a buf;
- *  0 is legal unless we are running in internal select mode (since
- *    this would cause busy-waiting); 0 in external select mode
- *    will cause this function to be called again once the external
- *    select calls MHD again;
- *  #MHD_CONTENT_READER_END_OF_STREAM (-1) for the regular
- *    end of transmission (with chunked encoding, MHD will then
- *    terminate the chunk and send any HTTP footers that might be
- *    present; without chunked encoding and given an unknown
- *    response size, MHD will simply close the connection; note
- *    that while returning #MHD_CONTENT_READER_END_OF_STREAM is not technically
- *    legal if a response size was specified, MHD accepts this
- *    and treats it just as #MHD_CONTENT_READER_END_WITH_ERROR;
- *  #MHD_CONTENT_READER_END_WITH_ERROR (-2) to indicate a server
- *    error generating the response; this will cause MHD to simply
- *    close the connection immediately.  If a response size was
- *    given or if chunked encoding is in use, this will indicate
- *    an error to the client.  Note, however, that if the client
- *    does not know a response size and chunked encoding is not in
- *    use, then clients will not be able to tell the difference between
- *    #MHD_CONTENT_READER_END_WITH_ERROR and #MHD_CONTENT_READER_END_OF_STREAM.
- *    This is not a limitation of MHD but rather of the HTTP protocol.
- */
-typedef ssize_t
-(*MHD_ContentReaderCallback) (void *cls,
-                              uint64_t pos,
-                              char *buf,
-                              size_t max);
-
-
-/**
- * This method is called by libmicrohttpd if we are done with a
- * content reader.  It should be used to free resources associated
- * with the content reader.
- *
- * @param cls closure
- * @ingroup response
- */
-typedef void
-(*MHD_ContentReaderFreeCallback) (void *cls);
-
-
-/**
- * Create a response action.  The response object can be extended with
- * header information and then be used any number of times.
- *
- * @param sc status code to return
- * @param size size of the data portion of the response, #MHD_SIZE_UNKNOWN for unknown
- * @param block_size preferred block size for querying crc (advisory only,
- *                   MHD may still call @a crc using smaller chunks); this
- *                   is essentially the buffer size used for IO, clients
- *                   should pick a value that is appropriate for IO and
- *                   memory performance requirements
- * @param crc callback to use to obtain response data
- * @param crc_cls extra argument to @a crc
- * @param crfc callback to call to free @a crc_cls resources
- * @return NULL on error (i.e. invalid arguments, out of memory)
- * @ingroup response
- */
-_MHD_EXTERN struct MHD_Response *
-MHD_response_from_callback (enum MHD_HTTP_StatusCode sc,
-                            uint64_t size,
-                            size_t block_size,
-                            MHD_ContentReaderCallback crc,
-                            void *crc_cls,
-                            MHD_ContentReaderFreeCallback crfc);
-
-
-/**
- * Specification for how MHD should treat the memory buffer
- * given for the response.
- * @ingroup response
- */
-enum MHD_ResponseMemoryMode
-{
-
-  /**
-   * Buffer is a persistent (static/global) buffer that won't change
-   * for at least the lifetime of the response, MHD should just use
-   * it, not free it, not copy it, just keep an alias to it.
-   * @ingroup response
-   */
-  MHD_RESPMEM_PERSISTENT,
-
-  /**
-   * Buffer is heap-allocated with `malloc()` (or equivalent) and
-   * should be freed by MHD after processing the response has
-   * concluded (response reference counter reaches zero).
-   * @ingroup response
-   */
-  MHD_RESPMEM_MUST_FREE,
-
-  /**
-   * Buffer is in transient memory, but not on the heap (for example,
-   * on the stack or non-`malloc()` allocated) and only valid during the
-   * call to #MHD_create_response_from_buffer.  MHD must make its
-   * own private copy of the data for processing.
-   * @ingroup response
-   */
-  MHD_RESPMEM_MUST_COPY
-
-};
-
-
-/**
- * Create a response object.  The response object can be extended with
- * header information and then be used any number of times.
- *
- * @param sc status code to use for the response;
- *           #MHD_HTTP_NO_CONTENT is only valid if @a size is 0;
- * @param size size of the data portion of the response
- * @param buffer size bytes containing the response's data portion
- * @param mode flags for buffer management
- * @return NULL on error (i.e. invalid arguments, out of memory)
- * @ingroup response
- */
-_MHD_EXTERN struct MHD_Response *
-MHD_response_from_buffer (enum MHD_HTTP_StatusCode sc,
-                          size_t size,
-                          void *buffer,
-                          enum MHD_ResponseMemoryMode mode);
-
-
-/**
- * Create a response object based on an @a fd from which
- * data is read.  The response object can be extended with
- * header information and then be used any number of times.
- *
- * @param sc status code to return
- * @param fd file descriptor referring to a file on disk with the
- *        data; will be closed when response is destroyed;
- *        fd should be in 'blocking' mode
- * @param offset offset to start reading from in the file;
- *        reading file beyond 2 GiB may be not supported by OS or
- *        MHD build; see ::MHD_FEATURE_LARGE_FILE
- * @param size size of the data portion of the response;
- *        sizes larger than 2 GiB may be not supported by OS or
- *        MHD build; see ::MHD_FEATURE_LARGE_FILE
- * @return NULL on error (i.e. invalid arguments, out of memory)
- * @ingroup response
- */
-_MHD_EXTERN struct MHD_Response *
-MHD_response_from_fd (enum MHD_HTTP_StatusCode sc,
-                      int fd,
-                      uint64_t offset,
-                      uint64_t size);
-
-
-/**
- * Enumeration for operations MHD should perform on the underlying socket
- * of the upgrade.  This API is not finalized, and in particular
- * the final set of actions is yet to be decided. This is just an
- * idea for what we might want.
- */
-enum MHD_UpgradeOperation
-{
-
-  /**
-   * Close the socket, the application is done with it.
-   *
-   * Takes no extra arguments.
-   */
-  MHD_UPGRADE_OPERATION_CLOSE = 0
-
-};
-
-
-/**
- * Handle given to the application to manage special
- * actions relating to MHD responses that "upgrade"
- * the HTTP protocol (i.e. to WebSockets).
- */
-struct MHD_UpgradeResponseHandle;
-
-
-/**
- * This connection-specific callback is provided by MHD to
- * applications (unusual) during the #MHD_UpgradeHandler.
- * It allows applications to perform 'special' actions on
- * the underlying socket from the upgrade.
- *
- * FIXME: this API still uses the untyped, ugly varargs.
- * Should we not modernize this one as well?
- *
- * @param urh the handle identifying the connection to perform
- *            the upgrade @a action on.
- * @param operation which operation should be performed
- * @param ... arguments to the action (depends on the action)
- * @return #MHD_NO on error, #MHD_YES on success
- */
-_MHD_EXTERN enum MHD_Bool
-MHD_upgrade_operation (struct MHD_UpgradeResponseHandle *urh,
-                       enum MHD_UpgradeOperation operation,
-                       ...)
-MHD_NONNULL (1);
-
-
-/**
- * Function called after a protocol "upgrade" response was sent
- * successfully and the socket should now be controlled by some
- * protocol other than HTTP.
- *
- * Any data already received on the socket will be made available in
- * @e extra_in.  This can happen if the application sent extra data
- * before MHD send the upgrade response.  The application should
- * treat data from @a extra_in as if it had read it from the socket.
- *
- * Note that the application must not close() @a sock directly,
- * but instead use #MHD_upgrade_action() for special operations
- * on @a sock.
- *
- * Data forwarding to "upgraded" @a sock will be started as soon
- * as this function return.
- *
- * Except when in 'thread-per-connection' mode, implementations
- * of this function should never block (as it will still be called
- * from within the main event loop).
- *
- * @param cls closure, whatever was given to #MHD_response_create_for_upgrade().
- * @param connection original HTTP connection handle,
- *                   giving the function a last chance
- *                   to inspect the original HTTP request
- * @param req_cls last value left in `req_cls` of the `MHD_AccessHandlerCallback`
- * @param extra_in if we happened to have read bytes after the
- *                 HTTP header already (because the client sent
- *                 more than the HTTP header of the request before
- *                 we sent the upgrade response),
- *                 these are the extra bytes already read from @a sock
- *                 by MHD.  The application should treat these as if
- *                 it had read them from @a sock.
- * @param extra_in_size number of bytes in @a extra_in
- * @param sock socket to use for bi-directional communication
- *        with the client.  For HTTPS, this may not be a socket
- *        that is directly connected to the client and thus certain
- *        operations (TCP-specific setsockopt(), getsockopt(), etc.)
- *        may not work as expected (as the socket could be from a
- *        socketpair() or a TCP-loopback).  The application is expected
- *        to perform read()/recv() and write()/send() calls on the socket.
- *        The application may also call shutdown(), but must not call
- *        close() directly.
- * @param urh argument for #MHD_upgrade_action()s on this @a connection.
- *        Applications must eventually use this callback to (indirectly)
- *        perform the close() action on the @a sock.
- */
-typedef void
-(*MHD_UpgradeHandler)(void *cls,
-                      struct MHD_Connection *connection,
-                      void *req_cls,
-                      const char *extra_in,
-                      size_t extra_in_size,
-                      MHD_socket sock,
-                      struct MHD_UpgradeResponseHandle *urh);
-
-
-/**
- * Create a response object that can be used for 101 UPGRADE
- * responses, for example to implement WebSockets.  After sending the
- * response, control over the data stream is given to the callback (which
- * can then, for example, start some bi-directional communication).
- * If the response is queued for multiple connections, the callback
- * will be called for each connection.  The callback
- * will ONLY be called after the response header was successfully passed
- * to the OS; if there are communication errors before, the usual MHD
- * connection error handling code will be performed.
- *
- * MHD will automatically set the correct HTTP status
- * code (#MHD_HTTP_SWITCHING_PROTOCOLS).
- * Setting correct HTTP headers for the upgrade must be done
- * manually (this way, it is possible to implement most existing
- * WebSocket versions using this API; in fact, this API might be useful
- * for any protocol switch, not just WebSockets).  Note that
- * draft-ietf-hybi-thewebsocketprotocol-00 cannot be implemented this
- * way as the header "HTTP/1.1 101 WebSocket Protocol Handshake"
- * cannot be generated; instead, MHD will always produce "HTTP/1.1 101
- * Switching Protocols" (if the response code 101 is used).
- *
- * As usual, the response object can be extended with header
- * information and then be used any number of times (as long as the
- * header information is not connection-specific).
- *
- * @param upgrade_handler function to call with the "upgraded" socket
- * @param upgrade_handler_cls closure for @a upgrade_handler
- * @return NULL on error (i.e. invalid arguments, out of memory)
- */
-_MHD_EXTERN struct MHD_Response *
-MHD_response_for_upgrade (MHD_UpgradeHandler upgrade_handler,
-                          void *upgrade_handler_cls)
-MHD_NONNULL (1);
-
-
-/**
- * Explicitly decrease reference counter of a response object.  If the
- * counter hits zero, destroys a response object and associated
- * resources.  Usually, this is implicitly done by converting a
- * response to an action and returning the action to MHD.
- *
- * @param response response to decrement RC of
- * @ingroup response
- */
-_MHD_EXTERN void
-MHD_response_queue_for_destroy (struct MHD_Response *response)
-MHD_NONNULL (1);
-
-
-/**
- * Add a header line to the response.
- *
- * @param response response to add a header to
- * @param header the header to add
- * @param content value to add
- * @return #MHD_NO on error (i.e. invalid header or content format),
- *         or out of memory
- * @ingroup response
- */
-_MHD_EXTERN enum MHD_Bool
-MHD_response_add_header (struct MHD_Response *response,
-                         const char *header,
-                         const char *content)
-MHD_NONNULL (1,2,3);
-
-
-/**
- * Add a tailer line to the response.
- *
- * @param response response to add a footer to
- * @param footer the footer to add
- * @param content value to add
- * @return #MHD_NO on error (i.e. invalid footer or content format),
- *         or out of memory
- * @ingroup response
- */
-_MHD_EXTERN enum MHD_Bool
-MHD_response_add_trailer (struct MHD_Response *response,
-                          const char *footer,
-                          const char *content)
-MHD_NONNULL (1,2,3);
-
-
-/**
- * Delete a header (or footer) line from the response.
- *
- * @param response response to remove a header from
- * @param header the header to delete
- * @param content value to delete
- * @return #MHD_NO on error (no such header known)
- * @ingroup response
- */
-_MHD_EXTERN enum MHD_Bool
-MHD_response_del_header (struct MHD_Response *response,
-                         const char *header,
-                         const char *content)
-MHD_NONNULL (1,2,3);
-
-
-/**
- * Get all of the headers (and footers) added to a response.
- *
- * @param response response to query
- * @param iterator callback to call on each header;
- *        maybe NULL (then just count headers)
- * @param iterator_cls extra argument to @a iterator
- * @return number of entries iterated over
- * @ingroup response
- */
-_MHD_EXTERN unsigned int
-MHD_response_get_headers (struct MHD_Response *response,
-                          MHD_KeyValueIterator iterator,
-                          void *iterator_cls)
-MHD_NONNULL (1);
-
-
-/**
- * Get a particular header (or footer) from the response.
- *
- * @param response response to query
- * @param key which header to get
- * @return NULL if header does not exist
- * @ingroup response
- */
-_MHD_EXTERN const char *
-MHD_response_get_header (struct MHD_Response *response,
-                         const char *key)
-MHD_NONNULL (1,2);
-
-
-/* ************Upload and PostProcessor functions ********************** */
-
-
-/**
- * Action telling MHD to continue processing the upload.
- *
- * @return action operation, never NULL
- */
-_MHD_EXTERN const struct MHD_Action *
-MHD_action_continue (void);
-
-
-/**
- * Function to process data uploaded by a client.
- *
- * @param cls argument given together with the function
- *        pointer when the handler was registered with MHD
- * @param upload_data the data being uploaded (excluding headers)
- *        POST data will typically be made available incrementally via
- *        multiple callbacks
- * @param[in,out] upload_data_size set initially to the size of the
- *        @a upload_data provided; the method must update this
- *        value to the number of bytes NOT processed;
- * @return action specifying how to proceed, often
- *         #MHD_action_continue() if all is well,
- *         #MHD_action_suspend() to stop reading the upload until
- *              the request is resumed,
- *         NULL to close the socket, or a response
- *         to discard the rest of the upload and return the data given
- */
-typedef const struct MHD_Action *
-(*MHD_UploadCallback) (void *cls,
-                       const char *upload_data,
-                       size_t *upload_data_size);
-
-
-/**
- * Create an action that handles an upload.
- *
- * @param uc function to call with uploaded data
- * @param uc_cls closure for @a uc
- * @return NULL on error (out of memory)
- * @ingroup action
- */
-_MHD_EXTERN const struct MHD_Action *
-MHD_action_process_upload (MHD_UploadCallback uc,
-                           void *uc_cls)
-MHD_NONNULL (1);
-
-
-/**
- * Iterator over key-value pairs where the value maybe made available
- * in increments and/or may not be zero-terminated.  Used for
- * MHD parsing POST data.  To access "raw" data from POST or PUT
- * requests, use #MHD_action_process_upload() instead.
- *
- * @param cls user-specified closure
- * @param kind type of the value, always #MHD_POSTDATA_KIND when called from MHD
- * @param key 0-terminated key for the value
- * @param filename name of the uploaded file, NULL if not known
- * @param content_type mime-type of the data, NULL if not known
- * @param transfer_encoding encoding of the data, NULL if not known
- * @param data pointer to @a size bytes of data at the
- *              specified offset
- * @param off offset of data in the overall value
- * @param size number of bytes in @a data available
- * @return action specifying how to proceed, often
- *         #MHD_action_continue() if all is well,
- *         #MHD_action_suspend() to stop reading the upload until
- *              the request is resumed,
- *         NULL to close the socket, or a response
- *         to discard the rest of the upload and return the data given
- */
-typedef const struct MHD_Action *
-(*MHD_PostDataIterator) (void *cls,
-                         enum MHD_ValueKind kind,
-                         const char *key,
-                         const char *filename,
-                         const char *content_type,
-                         const char *transfer_encoding,
-                         const char *data,
-                         uint64_t off,
-                         size_t size);
-
-
-/**
- * Create an action that parses a POST request.
- *
- * This action can be used to (incrementally) parse the data portion
- * of a POST request.  Note that some buggy browsers fail to set the
- * encoding type.  If you want to support those, you may have to call
- * #MHD_set_connection_value with the proper encoding type before
- * returning this action (if no supported encoding type is detected,
- * returning this action will cause a bad request to be returned to
- * the client).
- *
- * @param buffer_size maximum number of bytes to use for
- *        internal buffering (used only for the parsing,
- *        specifically the parsing of the keys).  A
- *        tiny value (256-1024) should be sufficient.
- *        Do NOT use a value smaller than 256.  For good
- *        performance, use 32 or 64k (i.e. 65536).
- * @param iter iterator to be called with the parsed data,
- *        Must NOT be NULL.
- * @param iter_cls first argument to @a iter
- * @return NULL on error (out of memory, unsupported encoding),
- *         otherwise a PP handle
- * @ingroup request
- */
-_MHD_EXTERN const struct MHD_Action *
-MHD_action_parse_post (size_t buffer_size,
-                       MHD_PostDataIterator iter,
-                       void *iter_cls)
-MHD_NONNULL (2);
-
-
-/* ********************** generic query functions ********************** */
-
-
-/**
- * Select which member of the `struct ConnectionInformation`
- * union is desired to be returned by #MHD_connection_get_info().
- */
-enum MHD_ConnectionInformationType
-{
-  /**
-   * What cipher algorithm is being used.
-   * Takes no extra arguments.
-   * @ingroup request
-   */
-  MHD_CONNECTION_INFORMATION_CIPHER_ALGO,
-
-  /**
-   *
-   * Takes no extra arguments.
-   * @ingroup request
-   */
-  MHD_CONNECTION_INFORMATION_PROTOCOL,
-
-  /**
-   * Obtain IP address of the client.  Takes no extra arguments.
-   * Returns essentially a `struct sockaddr **` (since the API returns
-   * a `union MHD_ConnectionInfo *` and that union contains a `struct
-   * sockaddr *`).
-   * @ingroup request
-   */
-  MHD_CONNECTION_INFORMATION_CLIENT_ADDRESS,
-
-  /**
-   * Get the gnuTLS session handle.
-   * @ingroup request
-   */
-  MHD_CONNECTION_INFORMATION_GNUTLS_SESSION,
-
-  /**
-   * Get the gnuTLS client certificate handle.  Dysfunctional (never
-   * implemented, deprecated).  Use #MHD_CONNECTION_INFORMATION_GNUTLS_SESSION
-   * to get the `gnutls_session_t` and then call
-   * gnutls_certificate_get_peers().
-   */
-  MHD_CONNECTION_INFORMATION_GNUTLS_CLIENT_CERT,
-
-  /**
-   * Get the `struct MHD_Daemon *` responsible for managing this connection.
-   * @ingroup request
-   */
-  MHD_CONNECTION_INFORMATION_DAEMON,
-
-  /**
-   * Request the file descriptor for the connection socket.
-   * No extra arguments should be passed.
-   * @ingroup request
-   */
-  MHD_CONNECTION_INFORMATION_CONNECTION_FD,
-
-  /**
-   * Returns the client-specific pointer to a `void *` that was (possibly)
-   * set during a #MHD_NotifyConnectionCallback when the socket was
-   * first accepted.  Note that this is NOT the same as the "req_cls"
-   * argument of the #MHD_AccessHandlerCallback.  The "req_cls" is
-   * fresh for each HTTP request, while the "socket_context" is fresh
-   * for each socket.
-   */
-  MHD_CONNECTION_INFORMATION_SOCKET_CONTEXT,
-
-  /**
-   * Get connection timeout
-   * @ingroup request
-   */
-  MHD_CONNECTION_INFORMATION_CONNECTION_TIMEOUT,
-
-  /**
-   * Check whether the connection is suspended.
-   * @ingroup request
-   */
-  MHD_CONNECTION_INFORMATION_CONNECTION_SUSPENDED
-
-
-};
-
-
-/**
- * Information about a connection.
- */
-union MHD_ConnectionInformation
-{
-
-  /**
-   * Cipher algorithm used, of type "enum gnutls_cipher_algorithm".
-   */
-  int /* enum gnutls_cipher_algorithm */ cipher_algorithm;
-
-  /**
-   * Protocol used, of type "enum gnutls_protocol".
-   */
-  int /* enum gnutls_protocol */ protocol;
-
-  /**
-   * Amount of second that connection could spend in idle state
-   * before automatically disconnected.
-   * Zero for no timeout (unlimited idle time).
-   */
-  unsigned int connection_timeout;
-
-  /**
-   * Connect socket
-   */
-  MHD_socket connect_fd;
-
-  /**
-   * GNUtls session handle, of type "gnutls_session_t".
-   */
-  void * /* gnutls_session_t */ tls_session;
-
-  /**
-   * GNUtls client certificate handle, of type "gnutls_x509_crt_t".
-   */
-  void * /* gnutls_x509_crt_t */ client_cert;
-
-  /**
-   * Address information for the client.
-   */
-  const struct sockaddr *client_addr;
-
-  /**
-   * Which daemon manages this connection (useful in case there are many
-   * daemons running).
-   */
-  struct MHD_Daemon *daemon;
-
-  /**
-   * Pointer to connection-specific client context.  Points to the
-   * same address as the "socket_context" of the
-   * #MHD_NotifyConnectionCallback.
-   */
-  void **socket_context;
-
-  /**
-   * Is this connection right now suspended?
-   */
-  enum MHD_Bool suspended;
-};
-
-
-/**
- * Obtain information about the given connection.
- * Use wrapper macro #MHD_connection_get_information() instead of direct use
- * of this function.
- *
- * @param connection what connection to get information about
- * @param info_type what information is desired?
- * @param[out] return_value pointer to union where requested information will
- *                          be stored
- * @param return_value_size size of union MHD_ConnectionInformation at compile
- *                          time
- * @return #MHD_YES on success, #MHD_NO on error
- *         (@a info_type is unknown, NULL pointer etc.)
- * @ingroup specialized
- */
-_MHD_EXTERN enum MHD_Bool
-MHD_connection_get_information_sz (struct MHD_Connection *connection,
-                                   enum MHD_ConnectionInformationType info_type,
-                                   union MHD_ConnectionInformation *return_value,
-                                   size_t return_value_size)
-MHD_NONNULL (1,3);
-
-
-/**
- * Obtain information about the given connection.
- *
- * @param connection what connection to get information about
- * @param info_type what information is desired?
- * @param[out] return_value pointer to union where requested information will
- *                          be stored
- * @return #MHD_YES on success, #MHD_NO on error
- *         (@a info_type is unknown, NULL pointer etc.)
- * @ingroup specialized
- */
-#define MHD_connection_get_information(connection,   \
-                                       info_type,    \
-                                       return_value) \
-  MHD_connection_get_information_sz ((connection),(info_type),(return_value), \
-                                     sizeof(union MHD_ConnectionInformation))
-
-
-/**
- * Information we return about a request.
- */
-union MHD_RequestInformation
-{
-
-  /**
-   * Connection via which we received the request.
-   */
-  struct MHD_Connection *connection;
-
-  /**
-   * Pointer to client context.  Will also be given to
-   * the application in a #MHD_RequestTerminationCallback.
-   */
-  void **request_context;
-
-  /**
-   * HTTP version requested by the client.
-   */
-  const char *http_version;
-
-  /**
-   * HTTP method of the request, as a string.  Particularly useful if
-   * #MHD_HTTP_METHOD_UNKNOWN was given.
-   */
-  const char *http_method;
-
-  /**
-   * Size of the client's HTTP header.
-   */
-  size_t header_size;
-
-};
-
-
-/**
- * Select which member of the `struct RequestInformation`
- * union is desired to be returned by #MHD_request_get_info().
- */
-enum MHD_RequestInformationType
-{
-  /**
-   * Return which connection the request is associated with.
-   */
-  MHD_REQUEST_INFORMATION_CONNECTION,
-
-  /**
-   * Returns the client-specific pointer to a `void *` that
-   * is specific to this request.
-   */
-  MHD_REQUEST_INFORMATION_CLIENT_CONTEXT,
-
-  /**
-   * Return the HTTP version string given by the client.
-   * @ingroup request
-   */
-  MHD_REQUEST_INFORMATION_HTTP_VERSION,
-
-  /**
-   * Return the HTTP method used by the request.
-   * @ingroup request
-   */
-  MHD_REQUEST_INFORMATION_HTTP_METHOD,
-
-  /**
-   * Return length of the client's HTTP request header.
-   * @ingroup request
-   */
-  MHD_REQUEST_INFORMATION_HEADER_SIZE
-};
-
-
-/**
- * Obtain information about the given request.
- * Use wrapper macro #MHD_request_get_information() instead of direct use
- * of this function.
- *
- * @param request what request to get information about
- * @param info_type what information is desired?
- * @param[out] return_value pointer to union where requested information will
- *                          be stored
- * @param return_value_size size of union MHD_RequestInformation at compile
- *                          time
- * @return #MHD_YES on success, #MHD_NO on error
- *         (@a info_type is unknown, NULL pointer etc.)
- * @ingroup specialized
- */
-_MHD_EXTERN enum MHD_Bool
-MHD_request_get_information_sz (struct MHD_Request *request,
-                                enum MHD_RequestInformationType info_type,
-                                union MHD_RequestInformation *return_value,
-                                size_t return_value_size)
-MHD_NONNULL (1,3);
-
-
-/**
- * Obtain information about the given request.
- *
- * @param request what request to get information about
- * @param info_type what information is desired?
- * @param[out] return_value pointer to union where requested information will
- *                          be stored
- * @return #MHD_YES on success, #MHD_NO on error
- *         (@a info_type is unknown, NULL pointer etc.)
- * @ingroup specialized
- */
-#define MHD_request_get_information (request,      \
-                                     info_type,    \
-                                     return_value) \
-  MHD_request_get_information_sz ((request), (info_type), (return_value), \
-                                  sizeof(union MHD_RequestInformation))
-
-
-/**
- * Values of this enum are used to specify what
- * information about a daemon is desired.
- */
-enum MHD_DaemonInformationType
-{
-
-  /**
-   * Request the file descriptor for the listening socket.
-   * No extra arguments should be passed.
-   */
-  MHD_DAEMON_INFORMATION_LISTEN_SOCKET,
-
-  /**
-   * Request the file descriptor for the external epoll.
-   * No extra arguments should be passed.
-   */
-  MHD_DAEMON_INFORMATION_EPOLL_FD,
-
-  /**
-   * Request the number of current connections handled by the daemon.
-   * No extra arguments should be passed.
-   * Note: when using MHD in external polling mode, this type of request
-   * could be used only when #MHD_run()/#MHD_run_from_select is not
-   * working in other thread at the same time.
-   */
-  MHD_DAEMON_INFORMATION_CURRENT_CONNECTIONS,
-
-  /**
-   * Request the port number of daemon's listen socket.
-   * No extra arguments should be passed.
-   * Note: if port '0' was specified for #MHD_option_port(), returned
-   * value will be real port number.
-   */
-  MHD_DAEMON_INFORMATION_BIND_PORT
-};
-
-
-/**
- * Information about an MHD daemon.
- */
-union MHD_DaemonInformation
-{
-
-  /**
-   * Socket, returned for #MHD_DAEMON_INFORMATION_LISTEN_SOCKET.
-   */
-  MHD_socket listen_socket;
-
-  /**
-   * Bind port number, returned for #MHD_DAEMON_INFORMATION_BIND_PORT.
-   */
-  uint16_t port;
-
-  /**
-   * epoll FD, returned for #MHD_DAEMON_INFORMATION_EPOLL_FD.
-   */
-  int epoll_fd;
-
-  /**
-   * Number of active connections, for #MHD_DAEMON_INFORMATION_CURRENT_CONNECTIONS.
-   */
-  unsigned int num_connections;
-
-};
-
-
-/**
- * Obtain information about the given daemon.
- * Use wrapper macro #MHD_daemon_get_information() instead of direct use
- * of this function.
- *
- * @param daemon what daemon to get information about
- * @param info_type what information is desired?
- * @param[out] return_value pointer to union where requested information will
- *                          be stored
- * @param return_value_size size of union MHD_DaemonInformation at compile
- *                          time
- * @return #MHD_YES on success, #MHD_NO on error
- *         (@a info_type is unknown, NULL pointer etc.)
- * @ingroup specialized
- */
-_MHD_EXTERN enum MHD_Bool
-MHD_daemon_get_information_sz (struct MHD_Daemon *daemon,
-                               enum MHD_DaemonInformationType info_type,
-                               union MHD_DaemonInformation *return_value,
-                               size_t return_value_size)
-MHD_NONNULL (1,3);
-
-/**
- * Obtain information about the given daemon.
- *
- * @param daemon what daemon to get information about
- * @param info_type what information is desired?
- * @param[out] return_value pointer to union where requested information will
- *                          be stored
- * @return #MHD_YES on success, #MHD_NO on error
- *         (@a info_type is unknown, NULL pointer etc.)
- * @ingroup specialized
- */
-#define MHD_daemon_get_information(daemon,       \
-                                   info_type,    \
-                                   return_value) \
-  MHD_daemon_get_information_sz ((daemon), (info_type), (return_value), \
-                                 sizeof(union MHD_DaemonInformation));
-
-
-/**
- * Callback for serious error condition. The default action is to print
- * an error message and `abort()`.
- *
- * @param cls user specified value
- * @param file where the error occurred
- * @param line where the error occurred
- * @param reason error detail, may be NULL
- * @ingroup logging
- */
-typedef void
-(*MHD_PanicCallback) (void *cls,
-                      const char *file,
-                      unsigned int line,
-                      const char *reason);
-
-
-/**
- * Sets the global error handler to a different implementation.  @a cb
- * will only be called in the case of typically fatal, serious
- * internal consistency issues.  These issues should only arise in the
- * case of serious memory corruption or similar problems with the
- * architecture.  While @a cb is allowed to return and MHD will then
- * try to continue, this is never safe.
- *
- * The default implementation that is used if no panic function is set
- * simply prints an error message and calls `abort()`.  Alternative
- * implementations might call `exit()` or other similar functions.
- *
- * @param cb new error handler
- * @param cls passed to @a cb
- * @ingroup logging
- */
-_MHD_EXTERN void
-MHD_set_panic_func (MHD_PanicCallback cb,
-                    void *cls);
-
-
-/**
- * Process escape sequences ('%HH') Updates val in place; the
- * result should be UTF-8 encoded and cannot be larger than the input.
- * The result must also still be 0-terminated.
- *
- * @param val value to unescape (modified in the process)
- * @return length of the resulting val (`strlen(val)` may be
- *  shorter afterwards due to elimination of escape sequences)
- */
-_MHD_EXTERN size_t
-MHD_http_unescape (char *val)
-MHD_NONNULL (1);
-
-
-/**
- * Types of information about MHD features,
- * used by #MHD_is_feature_supported().
- */
-enum MHD_Feature
-{
-  /**
-   * Get whether messages are supported. If supported then in debug
-   * mode messages can be printed to stderr or to external logger.
-   */
-  MHD_FEATURE_MESSAGES = 1,
-
-  /**
-   * Get whether HTTPS is supported.  If supported then flag
-   * #MHD_USE_TLS and options #MHD_OPTION_HTTPS_MEM_KEY,
-   * #MHD_OPTION_HTTPS_MEM_CERT, #MHD_OPTION_HTTPS_MEM_TRUST,
-   * #MHD_OPTION_HTTPS_MEM_DHPARAMS, #MHD_OPTION_HTTPS_CRED_TYPE,
-   * #MHD_OPTION_HTTPS_PRIORITIES can be used.
-   */
-  MHD_FEATURE_TLS = 2,
-
-  /**
-   * Get whether option #MHD_OPTION_HTTPS_CERT_CALLBACK is
-   * supported.
-   */
-  MHD_FEATURE_HTTPS_CERT_CALLBACK = 3,
-
-  /**
-   * Get whether IPv6 is supported. If supported then flag
-   * #MHD_USE_IPv6 can be used.
-   */
-  MHD_FEATURE_IPv6 = 4,
-
-  /**
-   * Get whether IPv6 without IPv4 is supported. If not supported
-   * then IPv4 is always enabled in IPv6 sockets and
-   * flag #MHD_USE_DUAL_STACK if always used when #MHD_USE_IPv6 is
-   * specified.
-   */
-  MHD_FEATURE_IPv6_ONLY = 5,
-
-  /**
-   * Get whether `poll()` is supported. If supported then flag
-   * #MHD_USE_POLL can be used.
-   */
-  MHD_FEATURE_POLL = 6,
-
-  /**
-   * Get whether `epoll()` is supported. If supported then Flags
-   * #MHD_USE_EPOLL and
-   * #MHD_USE_EPOLL_INTERNAL_THREAD can be used.
-   */
-  MHD_FEATURE_EPOLL = 7,
-
-  /**
-   * Get whether shutdown on listen socket to signal other
-   * threads is supported. If not supported flag
-   * #MHD_USE_ITC is automatically forced.
-   */
-  MHD_FEATURE_SHUTDOWN_LISTEN_SOCKET = 8,
-
-  /**
-   * Get whether socketpair is used internally instead of pipe to
-   * signal other threads.
-   */
-  MHD_FEATURE_SOCKETPAIR = 9,
-
-  /**
-   * Get whether TCP Fast Open is supported. If supported then
-   * flag #MHD_USE_TCP_FASTOPEN and option
-   * #MHD_OPTION_TCP_FASTOPEN_QUEUE_SIZE can be used.
-   */
-  MHD_FEATURE_TCP_FASTOPEN = 10,
-
-  /**
-   * Get whether HTTP Basic authorization is supported. If supported
-   * then functions #MHD_basic_auth_get_username_password and
-   * #MHD_queue_basic_auth_fail_response can be used.
-   */
-  MHD_FEATURE_BASIC_AUTH = 11,
-
-  /**
-   * Get whether HTTP Digest authorization is supported. If
-   * supported then options #MHD_OPTION_DIGEST_AUTH_RANDOM,
-   * #MHD_OPTION_NONCE_NC_SIZE and
-   * #MHD_digest_auth_check() can be used.
-   */
-  MHD_FEATURE_DIGEST_AUTH = 12,
-
-  /**
-   * Get whether postprocessor is supported. If supported then
-   * functions #MHD_create_post_processor(), #MHD_post_process() and
-   * #MHD_destroy_post_processor() can
-   * be used.
-   */
-  MHD_FEATURE_POSTPROCESSOR = 13,
-
-  /**
-  * Get whether password encrypted private key for HTTPS daemon is
-  * supported. If supported then option
-  * ::MHD_OPTION_HTTPS_KEY_PASSWORD can be used.
-  */
-  MHD_FEATURE_HTTPS_KEY_PASSWORD = 14,
-
-  /**
-   * Get whether reading files beyond 2 GiB boundary is supported.
-   * If supported then #MHD_create_response_from_fd(),
-   * #MHD_create_response_from_fd64 #MHD_create_response_from_fd_at_offset()
-   * and #MHD_create_response_from_fd_at_offset64() can be used with sizes and
-   * offsets larger than 2 GiB. If not supported value of size+offset is
-   * limited to 2 GiB.
-   */
-  MHD_FEATURE_LARGE_FILE = 15,
-
-  /**
-   * Get whether MHD set names on generated threads.
-   */
-  MHD_FEATURE_THREAD_NAMES = 16,
-
-  /**
-   * Get whether HTTP "Upgrade" is supported.
-   * If supported then #MHD_ALLOW_UPGRADE, #MHD_upgrade_action() and
-   * #MHD_create_response_for_upgrade() can be used.
-   */
-  MHD_FEATURE_UPGRADE = 17,
-
-  /**
-   * Get whether it's safe to use same FD for multiple calls of
-   * #MHD_create_response_from_fd() and whether it's safe to use single
-   * response generated by #MHD_create_response_from_fd() with multiple
-   * connections at same time.
-   * If #MHD_is_feature_supported() return #MHD_NO for this feature then
-   * usage of responses with same file FD in multiple parallel threads may
-   * results in incorrect data sent to remote client.
-   * It's always safe to use same file FD in multiple responses if MHD
-   * is run in any single thread mode.
-   */
-  MHD_FEATURE_RESPONSES_SHARED_FD = 18,
-
-  /**
-   * Get whether MHD support automatic detection of bind port number.
-   * @sa #MHD_DAEMON_INFO_BIND_PORT
-   */
-  MHD_FEATURE_AUTODETECT_BIND_PORT = 19,
-
-  /**
-   * Get whether MHD support SIGPIPE suppression.
-   * If SIGPIPE suppression is not supported, application must handle
-   * SIGPIPE signal by itself.
-   */
-  MHD_FEATURE_AUTOSUPPRESS_SIGPIPE = 20,
-
-  /**
-   * Get whether MHD use system's sendfile() function to send
-   * file-FD based responses over non-TLS connections.
-   * @note Since v0.9.56
-   */
-  MHD_FEATURE_SENDFILE = 21
-};
-
-
-/**
- * Get information about supported MHD features.
- * Indicate that MHD was compiled with or without support for
- * particular feature. Some features require additional support
- * by kernel. Kernel support is not checked by this function.
- *
- * @param feature type of requested information
- * @return #MHD_YES if feature is supported by MHD, #MHD_NO if
- * feature is not supported or feature is unknown.
- * @ingroup specialized
- */
-_MHD_EXTERN enum MHD_Bool
-MHD_is_feature_supported (enum MHD_Feature feature);
-
-
-/**
- * What is this request waiting for?
- */
-enum MHD_RequestEventLoopInfo
-{
-  /**
-   * We are waiting to be able to read.
-   */
-  MHD_EVENT_LOOP_INFO_READ = 0,
-
-  /**
-   * We are waiting to be able to write.
-   */
-  MHD_EVENT_LOOP_INFO_WRITE = 1,
-
-  /**
-   * We are waiting for the application to provide data.
-   */
-  MHD_EVENT_LOOP_INFO_BLOCK = 2,
-
-  /**
-   * We are finished and are awaiting cleanup.
-   */
-  MHD_EVENT_LOOP_INFO_CLEANUP = 3
-};
-
-
-#endif

src/include/microhttpd_tls.h

@@ -1,196 +0,0 @@
-/*
-     This file is part of libmicrohttpd
-     Copyright (C) 2018 Christian Grothoff (and other contributing authors)
-
-     This library is free software; you can redistribute it and/or
-     modify it under the terms of the GNU Lesser General Public
-     License as published by the Free Software Foundation; either
-     version 2.1 of the License, or (at your option) any later version.
-
-     This library is distributed in the hope that it will be useful,
-     but WITHOUT ANY WARRANTY; without even the implied warranty of
-     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
-     Lesser General Public License for more details.
-
-     You should have received a copy of the GNU Lesser General Public
-     License along with this library; if not, write to the Free Software
-     Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
-*/
-
-/**
- * @file microhttpd_tls.h
- * @brief interface for TLS plugins of libmicrohttpd
- * @author Christian Grothoff
- */
-
-#ifndef MICROHTTPD_TLS_H
-#define MICROHTTPD_TLS_H
-
-#include <microhttpd2.h>
-
-/**
- * Version of the TLS ABI.
- */
-#define MHD_TLS_ABI_VERSION 0
-
-/**
- * Version of the TLS ABI as a string.
- * Must match #MHD_TLS_ABI_VERSION!
- */
-#define MHD_TLS_ABI_VERSION_STR "0"
-
-
-/**
- * Data structure kept per TLS client by the plugin.
- */
-struct MHD_TLS_ConnectionState;
-
-
-/**
- * Callback functions to use for TLS operations.
- */
-struct MHD_TLS_Plugin
-{
-  /**
-   * Closure with plugin's internal state, opaque to MHD.
-   */
-  void *cls;
-
-  /**
-   * Destroy the plugin, we are done with it.
-   */
-  void
-  (*done)(struct MHD_TLS_Plugin *plugin);
-
-  /**
-   * Initialize key and certificate data from memory.
-   *
-   * @param cls the @e cls of this struct
-   * @param mem_key private key (key.pem) to be used by the
-   *     HTTPS daemon.  Must be the actual data in-memory, not a filename.
-   * @param mem_cert certificate (cert.pem) to be used by the
-   *     HTTPS daemon.  Must be the actual data in-memory, not a filename.
-   * @param pass passphrase phrase to decrypt 'key.pem', NULL
-   *     if @param mem_key is in cleartext already
-   * @return #MHD_SC_OK upon success; TODO: define failure modes
-   */
-  enum MHD_StatusCode
-  (*init_kcp)(void *cls,
-              const char *mem_key,
-              const char *mem_cert,
-              const char *pass);
-
-
-  /**
-   * Initialize DH parameters.
-   *
-   * @param cls the @e cls of this struct
-   * @param dh parameters to use
-   * @return #MHD_SC_OK upon success; TODO: define failure modes
-   */
-  enum MHD_StatusCode
-  (*init_dhparams)(void *cls,
-                   const char *dh);
-
-
-  /**
-   * Initialize certificate to use for client authentication.
-   *
-   * @param cls the @e cls of this struct
-   * @param mem_trust client certificate
-   * @return #MHD_SC_OK upon success; TODO: define failure modes
-   */
-  enum MHD_StatusCode
-  (*init_mem_trust)(void *cls,
-                    const char *mem_trust);
-
-
-  /**
-   * Function called when we receive a connection and need
-   * to initialize our TLS state for it.
-   *
-   * @param cls the @e cls of this struct
-   * @param ... TBD
-   * @return NULL on error
-   */
-  struct MHD_TLS_ConnectionState *
-  (*setup_connection)(void *cls,
-                      ...);
-
-
-  enum MHD_Bool
-  (*handshake)(void *cls,
-               struct MHD_TLS_ConnectionState *cs);
-
-
-  enum MHD_Bool
-  (*idle_ready)(void *cls,
-                struct MHD_TLS_ConnectionState *cs);
-
-
-  enum MHD_Bool
-  (*update_event_loop_info)(void *cls,
-                            struct MHD_TLS_ConnectionState *cs,
-                            enum MHD_RequestEventLoopInfo *eli);
-
-  ssize_t
-  (*send)(void *cls,
-          struct MHD_TLS_ConnectionState *cs,
-          const void *buf,
-          size_t buf_size);
-
-
-  ssize_t
-  (*recv)(void *cls,
-          struct MHD_TLS_ConnectionState *cs,
-          void *buf,
-          size_t buf_size);
-
-
-  const char *
-  (*strerror)(void *cls,
-              int ec);
-
-  enum MHD_Bool
-  (*check_record_pending)(void *cls,
-                          struct MHD_TLS_ConnectionState *cs);
-
-  enum MHD_Bool
-  (*shutdown_connection)(void *cls,
-                         struct MHD_TLS_ConnectionState *cs);
-
-
-  void
-  (*teardown_connection)(void *cls,
-                         struct MHD_TLS_ConnectionState *cs);
-
-  /**
-   * TODO: More functions here....
-   */
-
-};
-
-
-/**
- * Signature of the initialization function each TLS plugin must
- * export.
- *
- * @param ciphers desired cipher suite
- * @return NULL on errors (in particular, invalid cipher suite)
- */
-typedef struct MHD_TLS_Plugin *
-(*MHD_TLS_PluginInit) (const char *ciphers);
-
-
-/**
- * Define function to be exported from the TLS plugin.
- *
- * @a body function body that receives `ciphers` argument
- *    and must return the plugin API, or NULL on error.
- */
-#define MHD_TLS_INIT(body) \
-  struct MHD_TLS_Plugin * \
-    MHD_TLS_init_ ## MHD_TLS_ABI_VERSION (const char *ciphers) \ \
-  {  body  }
-
-#endif

src/include/microhttpd_ws.h

@@ -1,1124 +0,0 @@
-/*
-     This file is part of libmicrohttpd
-     Copyright (C) 2021 Christian Grothoff (and other contributing authors)
-
-     This library is free software; you can redistribute it and/or
-     modify it under the terms of the GNU Lesser General Public
-     License as published by the Free Software Foundation; either
-     version 2.1 of the License, or (at your option) any later version.
-
-     This library is distributed in the hope that it will be useful,
-     but WITHOUT ANY WARRANTY; without even the implied warranty of
-     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
-     Lesser General Public License for more details.
-
-     You should have received a copy of the GNU Lesser General Public
-     License along with this library; if not, write to the Free Software
-     Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
-*/
-/**
- * @file microhttpd_ws.h
- * @brief interface for experimental web socket extension to libmicrohttpd
- * @author David Gausmann
- */
-/*
- *                            *** WARNING! ***
- * *   The websockets interface is currently in "experimental" stage.   *
- * * It does not work on architectures with endianness different from  *
- * * big endian and little endian and may have some portability issues.*
- * * API and ABI are not yet stable.                                   *
- */
-#ifndef MHD_MICROHTTPD_WS_H
-#define MHD_MICROHTTPD_WS_H
-
-
-#ifdef __cplusplus
-extern "C"
-{
-#if 0                           /* keep Emacsens' auto-indent happy */
-}
-#endif
-#endif
-
-
-/**
- * @brief Handle for the encoding/decoding of websocket data
- *        (one stream is used per websocket)
- * @ingroup websocket
- */
-struct MHD_WebSocketStream;
-
-/**
- * @brief Flags for the initialization of a websocket stream
- *        `struct MHD_WebSocketStream` used by
- *        #MHD_websocket_stream_init() or
- *        #MHD_websocket_stream_init2().
- * @ingroup websocket
- */
-enum MHD_WEBSOCKET_FLAG
-{
-  /**
-   * The websocket stream is initialized in server mode (default).
-   * Thus all outgoing payload will not be "masked".
-   * All incoming payload must be masked.
-   * This flag cannot be used together with #MHD_WEBSOCKET_FLAG_CLIENT
-   */
-  MHD_WEBSOCKET_FLAG_SERVER = 0,
-  /**
-   * The websocket stream is initialized in client mode.
-   * You will usually never use that mode in combination with libmicrohttpd,
-   * because libmicrohttpd provides a server and not a client.
-   * In client mode all outgoing payload will be "masked"
-   * (XOR-ed with random values).
-   * All incoming payload must be unmasked.
-   * If you use this mode, you must always call #MHD_websocket_stream_init2()
-   * instead of #MHD_websocket_stream_init(), because you need
-   * to pass a random number generator callback function for masking.
-   * This flag cannot be used together with #MHD_WEBSOCKET_FLAG_SERVER
-   */
-  MHD_WEBSOCKET_FLAG_CLIENT = 1,
-  /**
-   * You don't want to get fragmented data while decoding (default).
-   * Fragmented frames will be internally put together until
-   * they are complete.
-   * Whether or not data is fragmented is decided
-   * by the sender of the data during encoding.
-   * This cannot be used together with #MHD_WEBSOCKET_FLAG_WANT_FRAGMENTS
-   */
-  MHD_WEBSOCKET_FLAG_NO_FRAGMENTS = 0,
-  /**
-   * You want fragmented data, if it appears while decoding.
-   * You will receive the content of the fragmented frame,
-   * but if you are decoding text, you will never get an unfinished
-   * UTF-8 sequence (if the sequence appears between two fragments).
-   * Instead the text will end before the unfinished UTF-8 sequence.
-   * With the next fragment, which finishes the UTF-8 sequence,
-   * you will get the complete UTF-8 sequence.
-   * This cannot be used together with #MHD_WEBSOCKET_FLAG_NO_FRAGMENTS
-   */
-  MHD_WEBSOCKET_FLAG_WANT_FRAGMENTS = 2,
-  /**
-   * If the websocket stream becomes invalid during decoding due to
-   * protocol errors, a matching close frame will automatically
-   * be generated.
-   * The close frame will be returned via the parameters
-   * `payload` and `payload_len` of #MHD_websocket_decode() and
-   * the return value is negative
-   * (a value of `enum MHD_WEBSOCKET_STATUS`).
-   * The generated close frame must be freed by the caller
-   * with #MHD_websocket_free().
-   */
-  MHD_WEBSOCKET_FLAG_GENERATE_CLOSE_FRAMES_ON_ERROR = 4
-};
-
-/**
- * @brief Enum to specify the fragmenting behavior
- *        while encoding with #MHD_websocket_encode_text() or
- *        #MHD_websocket_encode_binary().
- * @ingroup websocket
- */
-enum MHD_WEBSOCKET_FRAGMENTATION
-{
-  /**
-   * You don't want to use fragmentation.
-   * The encoded frame consists of only one frame.
-   */
-  MHD_WEBSOCKET_FRAGMENTATION_NONE = 0,
-  /**
-   * You want to use fragmentation.
-   * The encoded frame is the first frame of
-   * a series of data frames of the same type
-   * (text or binary).
-   * You may send control frames (ping, pong or close)
-   * between these data frames.
-   */
-  MHD_WEBSOCKET_FRAGMENTATION_FIRST = 1,
-  /**
-   * You want to use fragmentation.
-   * The encoded frame is not the first frame of
-   * the series of data frames, but also not the last one.
-   * You may send control frames (ping, pong or close)
-   * between these data frames.
-   */
-  MHD_WEBSOCKET_FRAGMENTATION_FOLLOWING = 2,
-  /**
-   * You want to use fragmentation.
-   * The encoded frame is the last frame of
-   * the series of data frames, but also not the first one.
-   * After this frame, you may send all types of frames again.
-   */
-  MHD_WEBSOCKET_FRAGMENTATION_LAST = 3
-};
-
-/**
- * @brief Enum of the return value for almost every MHD_websocket function.
- *        Errors are negative and values equal to or above zero mean a success.
- *        Positive values are only used by #MHD_websocket_decode().
- * @ingroup websocket
- */
-enum MHD_WEBSOCKET_STATUS
-{
-  /**
-   * The call succeeded.
-   * For #MHD_websocket_decode() this means that no error occurred,
-   * but also no frame has been completed yet.
-   * For other functions this means simply a success.
-   */
-  MHD_WEBSOCKET_STATUS_OK = 0,
-  /**
-   * #MHD_websocket_decode() has decoded a text frame.
-   * The parameters `payload` and `payload_len` are filled with
-   * the decoded text (if any).
-   */
-  MHD_WEBSOCKET_STATUS_TEXT_FRAME = 0x1,
-  /**
-   * #MHD_websocket_decode() has decoded a binary frame.
-   * The parameters `payload` and `payload_len` are filled with
-   * the decoded binary data (if any).
-   */
-  MHD_WEBSOCKET_STATUS_BINARY_FRAME = 0x2,
-  /**
-   * #MHD_websocket_decode() has decoded a close frame.
-   * This means you must close the socket using #MHD_upgrade_action()
-   * with #MHD_UPGRADE_ACTION_CLOSE.
-   * You may respond with a close frame before closing.
-   * The parameters `payload` and `payload_len` are filled with
-   * the close reason (if any).
-   * The close reason starts with a two byte sequence of close code
-   * in network byte order (see `enum MHD_WEBSOCKET_CLOSEREASON`).
-   * After these two bytes a UTF-8 encoded close reason may follow.
-   * You can call #MHD_websocket_split_close_reason() to split that
-   * close reason.
-   */
-  MHD_WEBSOCKET_STATUS_CLOSE_FRAME = 0x8,
-  /**
-   * #MHD_websocket_decode() has decoded a ping frame.
-   * You should respond to this with a pong frame.
-   * The pong frame must contain the same binary data as
-   * the corresponding ping frame (if it had any).
-   * The parameters `payload` and `payload_len` are filled with
-   * the binary ping data (if any).
-   */
-  MHD_WEBSOCKET_STATUS_PING_FRAME = 0x9,
-  /**
-   * #MHD_websocket_decode() has decoded a pong frame.
-   * You should usually only receive pong frames if you sent
-   * a ping frame before.
-   * The binary data should be equal to your ping frame and can be
-   * used to distinguish the response if you sent multiple ping frames.
-   * The parameters `payload` and `payload_len` are filled with
-   * the binary pong data (if any).
-   */
-  MHD_WEBSOCKET_STATUS_PONG_FRAME = 0xA,
-  /**
-   * #MHD_websocket_decode() has decoded a text frame fragment.
-   * The parameters `payload` and `payload_len` are filled with
-   * the decoded text (if any).
-   * This is like #MHD_WEBSOCKET_STATUS_TEXT_FRAME, but it can only
-   * appear if you specified #MHD_WEBSOCKET_FLAG_WANT_FRAGMENTS during
-   * the call of #MHD_websocket_stream_init() or
-   * #MHD_websocket_stream_init2().
-   */
-  MHD_WEBSOCKET_STATUS_TEXT_FIRST_FRAGMENT = 0x11,
-  /**
-   * #MHD_websocket_decode() has decoded a binary frame fragment.
-   * The parameters `payload` and `payload_len` are filled with
-   * the decoded binary data (if any).
-   * This is like #MHD_WEBSOCKET_STATUS_BINARY_FRAME, but it can only
-   * appear if you specified #MHD_WEBSOCKET_FLAG_WANT_FRAGMENTS during
-   * the call of #MHD_websocket_stream_init() or
-   * #MHD_websocket_stream_init2().
-   */
-  MHD_WEBSOCKET_STATUS_BINARY_FIRST_FRAGMENT = 0x12,
-  /**
-   * #MHD_websocket_decode() has decoded the next text frame fragment.
-   * The parameters `payload` and `payload_len` are filled with
-   * the decoded text (if any).
-   * This is like #MHD_WEBSOCKET_STATUS_TEXT_FIRST_FRAGMENT, but it appears
-   * only after the first and before the last fragment of a series of fragments.
-   * It can only appear if you specified #MHD_WEBSOCKET_FLAG_WANT_FRAGMENTS
-   * during the call of #MHD_websocket_stream_init() or
-   * #MHD_websocket_stream_init2().
-   */
-  MHD_WEBSOCKET_STATUS_TEXT_NEXT_FRAGMENT = 0x21,
-  /**
-   * #MHD_websocket_decode() has decoded the next binary frame fragment.
-   * The parameters `payload` and `payload_len` are filled with
-   * the decoded binary data (if any).
-   * This is like #MHD_WEBSOCKET_STATUS_BINARY_FIRST_FRAGMENT, but it appears
-   * only after the first and before the last fragment of a series of fragments.
-   * It can only appear if you specified #MHD_WEBSOCKET_FLAG_WANT_FRAGMENTS
-   * during the call of #MHD_websocket_stream_init() or
-   * #MHD_websocket_stream_init2().
-   */
-  MHD_WEBSOCKET_STATUS_BINARY_NEXT_FRAGMENT = 0x22,
-  /**
-   * #MHD_websocket_decode() has decoded the last text frame fragment.
-   * The parameters `payload` and `payload_len` are filled with
-   * the decoded text (if any).
-   * This is like #MHD_WEBSOCKET_STATUS_TEXT_FIRST_FRAGMENT, but it appears
-   * only for the last fragment of a series of fragments.
-   * It can only appear if you specified #MHD_WEBSOCKET_FLAG_WANT_FRAGMENTS
-   * during the call of #MHD_websocket_stream_init() or
-   * #MHD_websocket_stream_init2().
-   */
-  MHD_WEBSOCKET_STATUS_TEXT_LAST_FRAGMENT = 0x41,
-  /**
-   * #MHD_websocket_decode() has decoded the last binary frame fragment.
-   * The parameters `payload` and `payload_len` are filled with
-   * the decoded binary data (if any).
-   * This is like #MHD_WEBSOCKET_STATUS_BINARY_FIRST_FRAGMENT, but it appears
-   * only for the last fragment of a series of fragments.
-   * It can only appear if you specified #MHD_WEBSOCKET_FLAG_WANT_FRAGMENTS
-   * during the call of #MHD_websocket_stream_init() or
-   * #MHD_websocket_stream_init2().
-   */
-  MHD_WEBSOCKET_STATUS_BINARY_LAST_FRAGMENT = 0x42,
-  /**
-   * The call failed and the stream is invalid now for decoding.
-   * You must close the websocket now using #MHD_upgrade_action()
-   * with #MHD_UPGRADE_ACTION_CLOSE.
-   * You may send a close frame before closing.
-   * This is only used by #MHD_websocket_decode() and happens
-   * if the stream contains errors (i. e. invalid byte data).
-   */
-  MHD_WEBSOCKET_STATUS_PROTOCOL_ERROR = -1,
-  /**
-   * You tried to decode something, but the stream has already
-   * been marked invalid.
-   * You must close the websocket now using #MHD_upgrade_action()
-   * with #MHD_UPGRADE_ACTION_CLOSE.
-   * You may send a close frame before closing.
-   * This is only used by #MHD_websocket_decode() and happens
-   * if you call #MDM_websocket_decode() again after
-   * has been invalidated.
-   * You can call #MHD_websocket_stream_is_valid() at any time
-   * to check whether a stream is invalid or not.
-   */
-  MHD_WEBSOCKET_STATUS_STREAM_BROKEN = -2,
-  /**
-   * A memory allocation failed. The stream remains valid.
-   * If this occurred while decoding, the decoding could be
-   * possible later if enough memory is available.
-   * This could happen while decoding if you received a too big data frame.
-   * You could try to specify max_payload_size during the call of
-   * #MHD_websocket_stream_init() or #MHD_websocket_stream_init2() to
-   * avoid this and close the websocket instead.
-   */
-  MHD_WEBSOCKET_STATUS_MEMORY_ERROR = -3,
-  /**
-   * You passed invalid parameters during the function call
-   * (i. e. a NULL pointer for a required parameter).
-   * The stream remains valid.
-   */
-  MHD_WEBSOCKET_STATUS_PARAMETER_ERROR = -4,
-  /**
-   * The maximum payload size has been exceeded.
-   * If you got this return code from #MHD_websocket_decode() then
-   * the stream becomes invalid and the websocket must be closed
-   * using #MHD_upgrade_action() with #MHD_UPGRADE_ACTION_CLOSE.
-   * You may send a close frame before closing.
-   * The maximum payload size is specified during the call of
-   * #MHD_websocket_stream_init() or #MHD_websocket_stream_init2().
-   * This can also appear if you specified 0 as maximum payload size
-   * when the message is greater than the maximum allocatable memory size
-   * (i. e. more than 4 GiB on 32 bit systems).
-   * If you got this return code from #MHD_websocket_encode_close(),
-   * #MHD_websocket_encode_ping() or #MHD_websocket_encode_pong() then
-   * you passed to much payload data. The stream remains valid then.
-   */
-  MHD_WEBSOCKET_STATUS_MAXIMUM_SIZE_EXCEEDED = -5,
-  /**
-   * An UTF-8 sequence is invalid.
-   * If you got this return code from #MHD_websocket_decode() then
-   * the stream becomes invalid and you must close the websocket
-   * using #MHD_upgrade_action() with #MHD_UPGRADE_ACTION_CLOSE.
-   * You may send a close frame before closing.
-   * If you got this from #MHD_websocket_encode_text() or
-   * #MHD_websocket_encode_close() then you passed invalid UTF-8 text.
-   * The stream remains valid then.
-   */
-  MHD_WEBSOCKET_STATUS_UTF8_ENCODING_ERROR = -6,
-  /**
-   * A check routine for the HTTP headers came to the conclusion that
-   * the header value isn't valid for a websocket handshake request.
-   * This value can only be returned from the following functions:
-   * * #MHD_websocket_check_http_version()
-   * * #MHD_websocket_check_connection_header()
-   * * #MHD_websocket_check_upgrade_header()
-   * * #MHD_websocket_check_version_header()
-   * * #MHD_websocket_create_accept_header()
-   */
-  MHD_WEBSOCKET_STATUS_NO_WEBSOCKET_HANDSHAKE_HEADER = -7
-};
-
-/**
- * @brief Enumeration of possible close reasons for close frames.
- *
- * The possible values are specified in RFC 6455 7.4.1
- * These close reasons here are the default set specified by RFC 6455,
- * but also other close reasons could be used.
- *
- * The definition is for short:
- * 0-999 are never used (if you pass 0 in
- *   #MHD_websocket_encode_close() then no close reason is used).
- * 1000-2999 are specified by RFC 6455.
- * 3000-3999 are specified by libraries, etc. but must be registered by IANA.
- * 4000-4999 are reserved for private use.
- *
- * @ingroup websocket
- */
-enum MHD_WEBSOCKET_CLOSEREASON
-{
-  /**
-   * This value is used as placeholder for #MHD_websocket_encode_close()
-   * to tell that you don't want to specify any reason.
-   * If you use this value then no reason text may be used.
-   * This value cannot be a result of decoding, because this value
-   * is not a valid close reason for the websocket protocol.
-   */
-  MHD_WEBSOCKET_CLOSEREASON_NO_REASON = 0,
-  /**
-   * You close the websocket because it fulfilled its purpose and shall
-   * now be closed in a normal, planned way.
-   */
-  MHD_WEBSOCKET_CLOSEREASON_REGULAR = 1000,
-  /**
-   * You close the websocket because you are shutting down the server or
-   * something similar.
-   */
-  MHD_WEBSOCKET_CLOSEREASON_GOING_AWAY = 1001,
-  /**
-   * You close the websocket because a protocol error occurred
-   * during decoding (i. e. invalid byte data).
-   */
-  MHD_WEBSOCKET_CLOSEREASON_PROTOCOL_ERROR = 1002,
-  /**
-   * You close the websocket because you received data which you don't accept.
-   * For example if you received a binary frame,
-   * but your application only expects text frames.
-   */
-  MHD_WEBSOCKET_CLOSEREASON_UNSUPPORTED_DATATYPE = 1003,
-  /**
-   * You close the websocket because it contains malformed UTF-8.
-   * The UTF-8 validity is automatically checked by #MHD_websocket_decode(),
-   * so you don't need to check it on your own.
-   * UTF-8 is specified in RFC 3629.
-   */
-  MHD_WEBSOCKET_CLOSEREASON_MALFORMED_UTF8 = 1007,
-  /**
-   * You close the websocket because of any reason.
-   * Usually this close reason is used if no other close reason
-   * is more specific or if you don't want to use any other close reason.
-   */
-  MHD_WEBSOCKET_CLOSEREASON_POLICY_VIOLATED = 1008,
-  /**
-   * You close the websocket because you received a frame which is too big
-   * to process.
-   * You can specify the maximum allowed payload size during the call of
-   * #MHD_websocket_stream_init() or #MHD_websocket_stream_init2().
-   */
-  MHD_WEBSOCKET_CLOSEREASON_MAXIMUM_ALLOWED_PAYLOAD_SIZE_EXCEEDED = 1009,
-  /**
-   * This status code can be sent by the client if it
-   * expected a specific extension, but this extension hasn't been negotiated.
-   */
-  MHD_WEBSOCKET_CLOSEREASON_MISSING_EXTENSION = 1010,
-  /**
-   * The server closes the websocket because it encountered
-   * an unexpected condition that prevented it from fulfilling the request.
-   */
-  MHD_WEBSOCKET_CLOSEREASON_UNEXPECTED_CONDITION = 1011
-};
-
-/**
- * @brief Enumeration of possible UTF-8 check steps
- *
- * These values are used during the encoding of fragmented text frames
- * or for error analysis while encoding text frames.
- * Its values specify the next step of the UTF-8 check.
- * UTF-8 sequences consist of one to four bytes.
- * This enumeration just says how long the current UTF-8 sequence is
- * and what is the next expected byte.
- *
- * @ingroup websocket
- */
-enum MHD_WEBSOCKET_UTF8STEP
-{
-  /**
-   * There is no open UTF-8 sequence.
-   * The next byte must be 0x00-0x7F or 0xC2-0xF4.
-   */
-  MHD_WEBSOCKET_UTF8STEP_NORMAL   = 0,
-  /**
-   * The second byte of a two byte UTF-8 sequence.
-   * The first byte was 0xC2-0xDF.
-   * The next byte must be 0x80-0xBF.
-   */
-  MHD_WEBSOCKET_UTF8STEP_UTF2TAIL_1OF1 = 1,
-  /**
-   * The second byte of a three byte UTF-8 sequence.
-   * The first byte was 0xE0.
-   * The next byte must be 0xA0-0xBF.
-   */
-  MHD_WEBSOCKET_UTF8STEP_UTF3TAIL1_1OF2 = 2,
-  /**
-  * The second byte of a three byte UTF-8 sequence.
-  * The first byte was 0xED.
-  * The next byte must by 0x80-0x9F.
-  */
-  MHD_WEBSOCKET_UTF8STEP_UTF3TAIL2_1OF2 = 3,
-  /**
-  * The second byte of a three byte UTF-8 sequence.
-  * The first byte was 0xE1-0xEC or 0xEE-0xEF.
-  * The next byte must be 0x80-0xBF.
-  */
-  MHD_WEBSOCKET_UTF8STEP_UTF3TAIL_1OF2 = 4,
-  /**
-  * The third byte of a three byte UTF-8 sequence.
-  * The next byte must be 0x80-0xBF.
-  */
-  MHD_WEBSOCKET_UTF8STEP_UTF3TAIL_2OF2 = 5,
-  /**
-   * The second byte of a four byte UTF-8 sequence.
-   * The first byte was 0xF0.
-   * The next byte must be 0x90-0xBF.
-   */
-  MHD_WEBSOCKET_UTF8STEP_UTF4TAIL1_1OF3 = 6,
-  /**
-   * The second byte of a four byte UTF-8 sequence.
-   * The first byte was 0xF4.
-   * The next byte must be 0x80-0x8F.
-   */
-  MHD_WEBSOCKET_UTF8STEP_UTF4TAIL2_1OF3 = 7,
-  /**
-   * The second byte of a four byte UTF-8 sequence.
-   * The first byte was 0xF1-0xF3.
-   * The next byte must be 0x80-0xBF.
-   */
-  MHD_WEBSOCKET_UTF8STEP_UTF4TAIL_1OF3 = 8,
-  /**
-   * The third byte of a four byte UTF-8 sequence.
-   * The next byte must be 0x80-0xBF.
-   */
-  MHD_WEBSOCKET_UTF8STEP_UTF4TAIL_2OF3 = 9,
-  /**
-  * The fourth byte of a four byte UTF-8 sequence.
-  * The next byte must be 0x80-0xBF.
-  */
-  MHD_WEBSOCKET_UTF8STEP_UTF4TAIL_3OF3 = 10
-};
-
-/**
-* @brief Enumeration of validity values
-*
-* These values are used for #MHD_websocket_stream_is_valid()
-* and specify the validity status.
-*
-* @ingroup websocket
-*/
-enum MHD_WEBSOCKET_VALIDITY
-{
-  /**
-  * The stream is invalid.
-  * It cannot be used for decoding anymore.
-  */
-  MHD_WEBSOCKET_VALIDITY_INVALID = 0,
-  /**
-   * The stream is valid.
-   * Decoding works as expected.
-   */
-  MHD_WEBSOCKET_VALIDITY_VALID   = 1,
-  /**
-   * The stream has received a close frame and
-   * is partly invalid.
-   * You can still use the stream for decoding,
-   * but if a data frame is received an error will be reported.
-   * After a close frame has been sent, no data frames
-   * may follow from the sender of the close frame.
-   */
-  MHD_WEBSOCKET_VALIDITY_ONLY_VALID_FOR_CONTROL_FRAMES = 2
-};
-/**
- * This callback function is used internally by many websocket functions
- * for allocating data.
- * By default `malloc()` is used.
- * You can use your own allocation function with
- * #MHD_websocket_stream_init2() if you wish to.
- * This can be useful for operating systems like Windows
- * where `malloc()`, `realloc()` and `free()` are compiler-dependent.
- * You can call the associated `malloc()` callback of
- * a websocket stream with #MHD_websocket_malloc().
- *
- * @param buf_len buffer size in bytes
- * @return allocated memory
- * @ingroup websocket
- */
-typedef void *
-(*MHD_WebSocketMallocCallback) (size_t buf_len);
-/**
- * This callback function is used internally by many websocket
- * functions for reallocating data.
- * By default `realloc()` is used.
- * You can use your own reallocation function with
- * #MHD_websocket_stream_init2() if you wish to.
- * This can be useful for operating systems like Windows
- * where `malloc()`, `realloc()` and `free()` are compiler-dependent.
- * You can call the associated `realloc()` callback of
- * a websocket stream with #MHD_websocket_realloc().
- *
- * @param buf buffer
- * @param new_buf_len new buffer size in bytes
- * @return reallocated memory
- * @ingroup websocket
- */
-typedef void *
-(*MHD_WebSocketReallocCallback) (void *buf, size_t new_buf_len);
-/**
- * This callback function is used internally by many websocket
- * functions for freeing data.
- * By default `free()` is used.
- * You can use your own free function with
- * #MHD_websocket_stream_init2() if you wish to.
- * This can be useful for operating systems like Windows
- * where `malloc()`, `realloc()` and `free()` are compiler-dependent.
- * You can call the associated `free()` callback of
- * a websocket stream with #MHD_websocket_free().
- *
- * @param buf buffer
- * @ingroup websocket
- */
-typedef void
-(*MHD_WebSocketFreeCallback) (void *buf);
-/**
- * This callback function is used for generating random numbers
- * for masking payload data in client mode.
- * If you use websockets in server mode with libmicrohttpd then
- * you don't need a random number generator, because
- * the server doesn't mask its outgoing messageses.
- * However if you wish to use a websocket stream in client mode,
- * you must pass this callback function to #MHD_websocket_stream_init2().
- *
- * @param cls closure specified in #MHD_websocket_stream_init2()
- * @param buf buffer to fill with random values
- * @param buf_len size of buffer in bytes
- * @return The number of generated random bytes.
- *         Should usually equal to buf_len.
- * @ingroup websocket
- */
-typedef size_t
-(*MHD_WebSocketRandomNumberGenerator) (void *cls, void *buf, size_t buf_len);
-
-/**
- * Checks the HTTP version of the incoming request.
- * Websocket requests are only allowed for HTTP/1.1 or above.
- *
- * @param http_version The value of the 'version' parameter of your
- *                     access_handler callback
- * @return A value of `enum MHD_WEBSOCKET_STATUS`.
- *         0 means the HTTP version is correct for a websocket request,
- *         a value less than zero means that the HTTP version isn't
- *         valid for a websocket request.
- * @ingroup websocket
- */
-_MHD_EXTERN enum MHD_WEBSOCKET_STATUS
-MHD_websocket_check_http_version (const char *http_version);
-
-/**
- * Checks the value of the 'Connection' HTTP request header.
- * Websocket requests require the token 'Upgrade' in
- * the 'Connection' HTTP request header.
- *
- * @param connection_header The value of the 'Connection' request header.
- *                          You can get this request header value by passing
- *                          #MHD_HTTP_HEADER_CONNECTION to
- *                          #MHD_lookup_connection_value().
- * @return A value of `enum MHD_WEBSOCKET_STATUS`.
- *         0 means the 'Connection' request header is correct
- *         for a websocket request,
- *         a value less than zero means that the 'Connection' header isn't
- *         valid for a websocket request.
- * @ingroup websocket
- */
-_MHD_EXTERN enum MHD_WEBSOCKET_STATUS
-MHD_websocket_check_connection_header (const char *connection_header);
-
-/**
- * Checks the value of the 'Upgrade' HTTP request header.
- * Websocket requests require the value 'websocket' in
- * the 'Upgrade' HTTP request header.
- *
- * @param upgrade_header The value of the 'Upgrade' request header.
- *                       You can get this request header value by passing
- *                       #MHD_HTTP_HEADER_UPGRADE to
- *                       #MHD_lookup_connection_value().
- * @return A value of `enum MHD_WEBSOCKET_STATUS`.
- *         0 means the 'Upgrade' request header is correct
- *         for a websocket request,
- *         a value less than zero means that the 'Upgrade' header isn't
- *         valid for a websocket request.
- * @ingroup websocket
- */
-_MHD_EXTERN enum MHD_WEBSOCKET_STATUS
-MHD_websocket_check_upgrade_header (const char *upgrade_header);
-
-/**
- * Checks the value of the 'Sec-WebSocket-Version' HTTP request header.
- * Websocket requests require the value '13'
- * in the 'Sec-WebSocket-Version' HTTP request header.
- *
- * @param version_header The value of the 'Sec-WebSocket-Version'
- *                       request header.
- *                       You can get this request header value by passing
- *                       #MHD_HTTP_HEADER_SEC_WEBSOCKET_VERSION to
- *                       #MHD_lookup_connection_value().
- * @return A value of `enum MHD_WEBSOCKET_STATUS`.
- *         0 means the 'Sec-WebSocket-Version' request header is correct
- *         for a websocket request,
- *         a value less than zero means that the 'Sec-WebSocket-Version'
- *         header isn't valid for a websocket request.
- * @ingroup websocket
- */
-_MHD_EXTERN enum MHD_WEBSOCKET_STATUS
-MHD_websocket_check_version_header (const char *version_header);
-
-/**
- * Creates the response value for the 'Sec-WebSocket-Key' HTTP request header.
- * The generated value must be sent to the client
- * as 'Sec-WebSocket-Accept' HTTP response header.
- *
- * @param sec_websocket_key The value of the 'Sec-WebSocket-Key'
- *                          request header.
- *                          You can get this request header value by passing
- *                          #MHD_HTTP_HEADER_SEC_WEBSOCKET_KEY to
- *                          #MHD_lookup_connection_value().
- * @param[out] sec_websocket_accept The response buffer, which will receive
- *                                  the generated 'Sec-WebSocket-Accept' header.
- *                                  This buffer must be at least 29 bytes long and
- *                                  will contain the response value plus
- *                                  a terminating NUL on success.
- * @return A value of `enum MHD_WEBSOCKET_STATUS`.
- *         Typically 0 on success or less than 0 on errors.
- * @ingroup websocket
- */
-_MHD_EXTERN enum MHD_WEBSOCKET_STATUS
-MHD_websocket_create_accept_header (const char *sec_websocket_key,
-                                    char *sec_websocket_accept);
-
-/**
- * Creates a new websocket stream, used for decoding/encoding.
- *
- * @param[out] ws The websocket stream
- * @param flags Combination of `enum MHD_WEBSOCKET_FLAG` values
- *              to modify the behavior of the websocket stream.
- * @param max_payload_size The maximum size for incoming payload
- *                         data in bytes. Use 0 to allow each size.
- * @return A value of `enum MHD_WEBSOCKET_STATUS`.
- *         Typically 0 on success or less than 0 on errors.
- * @ingroup websocket
- */
-_MHD_EXTERN enum MHD_WEBSOCKET_STATUS
-MHD_websocket_stream_init (struct MHD_WebSocketStream **ws,
-                           int flags,
-                           size_t max_payload_size);
-
-/**
- * Creates a new websocket stream, used for decoding/encoding,
- * but with custom memory functions for malloc, realloc and free.
- * Also a random number generator can be specified for client mode.
- *
- * @param[out] ws The websocket stream
- * @param flags Combination of `enum MHD_WEBSOCKET_FLAG` values
- *              to modify the behavior of the websocket stream.
- * @param max_payload_size The maximum size for incoming payload
- *                         data in bytes. Use 0 to allow each size.
- * @param callback_malloc  The callback function for `malloc()`.
- * @param callback_realloc The callback function for `realloc()`.
- * @param callback_free    The callback function for `free()`.
- * @param cls_rng          A closure for the random number generator callback.
- *                         This is only required when
- *                         MHD_WEBSOCKET_FLAG_CLIENT is passed in `flags`.
- *                         The given value is passed to
- *                         the random number generator.
- *                         May be NULL if not needed.
- *                         Should be NULL when you are
- *                         not using MHD_WEBSOCKET_FLAG_CLIENT.
- * @param callback_rng     A callback function for a
- *                         secure random number generator.
- *                         This is only required when
- *                         MHD_WEBSOCKET_FLAG_CLIENT is passed in `flags`.
- *                         Should be NULL otherwise.
- * @return A value of `enum MHD_WEBSOCKET_STATUS`.
- *         Typically 0 on success or less than 0 on errors.
- * @ingroup websocket
- */
-_MHD_EXTERN enum MHD_WEBSOCKET_STATUS
-MHD_websocket_stream_init2 (struct MHD_WebSocketStream **ws,
-                            int flags,
-                            size_t max_payload_size,
-                            MHD_WebSocketMallocCallback callback_malloc,
-                            MHD_WebSocketReallocCallback callback_realloc,
-                            MHD_WebSocketFreeCallback callback_free,
-                            void *cls_rng,
-                            MHD_WebSocketRandomNumberGenerator callback_rng);
-
-/**
- * Frees a websocket stream
- *
- * @param ws The websocket stream. This value may be NULL.
- * @return A value of `enum MHD_WEBSOCKET_STATUS`.
- *         Typically 0 on success or less than 0 on errors.
- * @ingroup websocket
- */
-_MHD_EXTERN enum MHD_WEBSOCKET_STATUS
-MHD_websocket_stream_free (struct MHD_WebSocketStream *ws);
-
-/**
- * Invalidates a websocket stream.
- * After invalidation a websocket stream cannot be used for decoding anymore.
- * Encoding is still possible.
- *
- * @param ws The websocket stream.
- * @return A value of `enum MHD_WEBSOCKET_STATUS`.
- *         Typically 0 on success or less than 0 on errors.
- * @ingroup websocket
- */
-_MHD_EXTERN enum MHD_WEBSOCKET_STATUS
-MHD_websocket_stream_invalidate (struct MHD_WebSocketStream *ws);
-
-/**
- * Queries whether a websocket stream is valid.
- * Invalidated websocket streams cannot be used for decoding anymore.
- * Encoding is still possible.
- *
- * @param ws The websocket stream.
- * @return A value of `enum MHD_WEBSOCKET_VALIDITY`.
- * @ingroup websocket
- */
-_MHD_EXTERN enum MHD_WEBSOCKET_VALIDITY
-MHD_websocket_stream_is_valid (struct MHD_WebSocketStream *ws);
-
-/**
- * Decodes a byte sequence for a websocket stream.
- * Decoding is done until either a frame is complete or
- * the end of the byte sequence is reached.
- *
- * @param ws The websocket stream.
- * @param streambuf The byte sequence for decoding.
- *                  Typically that what you received via `recv()`.
- * @param streambuf_len The length of the byte sequence @a streambuf
- * @param[out] streambuf_read_len The number of bytes which has been processed
- *                                by this call. This value may be less
- *                                than @a streambuf_len when a frame is decoded
- *                                before the end of the buffer is reached.
- *                                The remaining bytes of @a buf must be passed
- *                                to the next call of this function.
- * @param[out] payload Pointer to a variable, which receives a buffer
- *                     with the decoded payload data.
- *                     If no decoded data is available this is NULL.
- *                     When the returned value is not NULL then
- *                     the buffer contains always @a payload_len bytes plus
- *                     one terminating NUL character.
- *                     The caller must free this buffer
- *                     using #MHD_websocket_free().
- *                     If you passed the flag
- *                     #MHD_WEBSOCKET_FLAG_GENERATE_CLOSE_FRAMES_ON_ERROR
- *                     upon creation of this websocket stream and
- *                     a decoding error occurred
- *                     (function return value less than 0), then this
- *                     buffer contains a generated close frame
- *                     which must be sent via the socket to the recipient.
- *                     If you passed the flag #MHD_WEBSOCKET_FLAG_WANT_FRAGMENTS
- *                     upon creation of the websocket stream then
- *                     this payload may only be a part of the complete message.
- *                     Only complete UTF-8 sequences are returned
- *                     for fragmented text frames.
- *                     If necessary the UTF-8 sequence will be completed
- *                     with the next text fragment.
- * @param[out] payload_len The length of the result payload buffer in bytes.
- *
- * @return A value of `enum MHD_WEBSOCKET_STATUS`.
- *         This is greater than 0 if a frame has is complete,
- *         equal to 0 if more data is needed an less than 0 on errors.
- * @ingroup websocket
- */
-_MHD_EXTERN enum MHD_WEBSOCKET_STATUS
-MHD_websocket_decode (struct MHD_WebSocketStream *ws,
-                      const char *streambuf,
-                      size_t streambuf_len,
-                      size_t *streambuf_read_len,
-                      char **payload,
-                      size_t *payload_len);
-
-/**
- * Splits the payload of a decoded close frame.
- *
- * @param payload The payload of the close frame.
- *                This parameter may only be NULL if @a payload_len is 0.
- * @param payload_len The length of @a payload.
- * @param[out] reason_code The numeric close reason.
- *                         If there was no close reason, this is
- *                         #MHD_WEBSOCKET_CLOSEREASON_NO_REASON.
- *                         Compare with `enum MHD_WEBSOCKET_CLOSEREASON`.
- *                         This parameter is optional and may be NULL.
- * @param[out] reason_utf8 The literal close reason.
- *                         If there was no literal close reason, this is NULL.
- *                         This parameter is optional and may be NULL.
- *                         Please note that no memory is allocated
- *                         in this function.
- *                         If not NULL the returned value of this parameter
- *                         points to a position in the specified @a payload.
- * @param[out] reason_utf8_len The length of the literal close reason.
- *                             If there was no literal close reason, this is 0.
- *                             This parameter is optional and may be NULL.
- *
- * @return A value of `enum MHD_WEBSOCKET_STATUS`.
- *         This is #MHD_WEBSOCKET_STATUS_OK (= 0) on success
- *         or a value less than 0 on errors.
- * @ingroup websocket
- */
-_MHD_EXTERN enum MHD_WEBSOCKET_STATUS
-MHD_websocket_split_close_reason (const char *payload,
-                                  size_t payload_len,
-                                  unsigned short *reason_code,
-                                  const char **reason_utf8,
-                                  size_t *reason_utf8_len);
-
-/**
- * Encodes an UTF-8 encoded text into websocket text frame.
- *
- * @param ws The websocket stream.
- * @param payload_utf8 The UTF-8 encoded text to send.
- *                     This may be NULL if payload_utf8_len is 0.
- * @param payload_utf8_len The length of the UTF-8 encoded text in bytes.
- * @param fragmentation A value of `enum MHD_WEBSOCKET_FRAGMENTATION`
- *                      to specify the fragmentation behavior.
- *                      Specify MHD_WEBSOCKET_FRAGMENTATION_NONE
- *                      if you don't want to use fragmentation.
- * @param[out] frame This variable receives a buffer with the encoded frame.
- *                   This is what you typically send via `send()` to the recipient.
- *                   If no encoded data is available this is NULL.
- *                   When this variable is not NULL then the buffer contains always
- *                   @a frame_len bytes plus one terminating NUL character.
- *                   The caller must free this buffer using #MHD_websocket_free().
- * @param[out] frame_len The length of the encoded frame in bytes.
- * @param[out] utf8_step This parameter is required for fragmentation and
- *                       should be NULL if no fragmentation is used.
- *                       It contains information about the last encoded
- *                       UTF-8 sequence and is required to continue a previous
- *                       UTF-8 sequence when fragmentation is used.
- *                       `enum MHD_WEBSOCKET_UTF8STEP` is for this value.
- *                       If you start a new fragment using
- *                       MHD_WEBSOCKET_FRAGMENTATION_NONE or
- *                       MHD_WEBSOCKET_FRAGMENTATION_FIRST the value
- *                       of this variable will be initialized
- *                       to MHD_WEBSOCKET_UTF8STEP_NORMAL.
- *
- * @return A value of `enum MHD_WEBSOCKET_STATUS`.
- *         This is #MHD_WEBSOCKET_STATUS_OK (= 0) on success
- *         or a value less than 0 on errors.
- * @ingroup websocket
- */
-_MHD_EXTERN enum MHD_WEBSOCKET_STATUS
-MHD_websocket_encode_text (struct MHD_WebSocketStream *ws,
-                           const char *payload_utf8,
-                           size_t payload_utf8_len,
-                           int fragmentation,
-                           char **frame,
-                           size_t *frame_len,
-                           int *utf8_step);
-
-/**
- * Encodes binary data into websocket binary frame.
- *
- * @param ws The websocket stream.
- * @param payload The binary data to send.
- * @param payload_len The length of the binary data in bytes.
- * @param fragmentation A value of `enum MHD_WEBSOCKET_FRAGMENTATION`
- *                      to specify the fragmentation behavior.
- *                      Specify MHD_WEBSOCKET_FRAGMENTATION_NONE
- *                      if you don't want to use fragmentation.
- * @param[out] frame This variable receives a buffer with
- *                   the encoded binary frame.
- *                   This is what you typically send via `send()`
- *                   to the recipient.
- *                   If no encoded frame is available this is NULL.
- *                   When this variable is not NULL then the allocated buffer
- *                   contains always @a frame_len bytes plus one terminating
- *                   NUL character.
- *                   The caller must free this buffer using #MHD_websocket_free().
- * @param[out] frame_len The length of the result frame buffer in bytes.
- *
- * @return A value of `enum MHD_WEBSOCKET_STATUS`.
- *         This is #MHD_WEBSOCKET_STATUS_OK (= 0) on success
- *         or a value less than 0 on errors.
- * @ingroup websocket
- */
-_MHD_EXTERN enum MHD_WEBSOCKET_STATUS
-MHD_websocket_encode_binary (struct MHD_WebSocketStream *ws,
-                             const char *payload,
-                             size_t payload_len,
-                             int fragmentation,
-                             char **frame,
-                             size_t *frame_len);
-
-/**
- * Encodes a websocket ping frame
- *
- * @param ws The websocket stream.
- * @param payload The binary ping payload data to send.
- *                This may be NULL if @a payload_len is 0.
- * @param payload_len The length of the payload data in bytes.
- *                    This may not exceed 125 bytes.
- * @param[out] frame This variable receives a buffer with the encoded ping frame data.
- *                   This is what you typically send via `send()` to the recipient.
- *                   If no encoded frame is available this is NULL.
- *                   When this variable is not NULL then the buffer contains always
- *                   @a frame_len bytes plus one terminating NUL character.
- *                   The caller must free this buffer using #MHD_websocket_free().
- * @param[out] frame_len The length of the result frame buffer in bytes.
- *
- * @return A value of `enum MHD_WEBSOCKET_STATUS`.
- *         This is #MHD_WEBSOCKET_STATUS_OK (= 0) on success
- *         or a value less than 0 on errors.
- * @ingroup websocket
- */
-_MHD_EXTERN enum MHD_WEBSOCKET_STATUS
-MHD_websocket_encode_ping (struct MHD_WebSocketStream *ws,
-                           const char *payload,
-                           size_t payload_len,
-                           char **frame,
-                           size_t *frame_len);
-
-/**
- * Encodes a websocket pong frame
- *
- * @param ws The websocket stream.
- * @param payload The binary pong payload data, which should be
- *                the decoded payload from the received ping frame.
- *                This may be NULL if @a payload_len is 0.
- * @param payload_len The length of the payload data in bytes.
- *                    This may not exceed 125 bytes.
- * @param[out] frame This variable receives a buffer with
- *                   the encoded pong frame data.
- *                   This is what you typically send via `send()`
- *                   to the recipient.
- *                   If no encoded frame is available this is NULL.
- *                   When this variable is not NULL then the buffer
- *                   contains always @a frame_len bytes plus one
- *                   terminating NUL character.
- *                   The caller must free this buffer
- *                   using #MHD_websocket_free().
- * @param[out] frame_len The length of the result frame buffer in bytes.
- *
- * @return A value of `enum MHD_WEBSOCKET_STATUS`.
- *         This is #MHD_WEBSOCKET_STATUS_OK (= 0) on success
- *         or a value less than 0 on errors.
- * @ingroup websocket
- */
-_MHD_EXTERN enum MHD_WEBSOCKET_STATUS
-MHD_websocket_encode_pong (struct MHD_WebSocketStream *ws,
-                           const char *payload,
-                           size_t payload_len,
-                           char **frame,
-                           size_t *frame_len);
-
-/**
- * Encodes a websocket close frame
- *
- * @param ws The websocket stream.
- * @param reason_code The reason for close.
- *                    You can use `enum MHD_WEBSOCKET_CLOSEREASON`
- *                    for typical reasons,
- *                    but you are not limited to these values.
- *                    The allowed values are specified in RFC 6455 7.4.
- *                    If you don't want to enter a reason, you can specify
- *                    #MHD_WEBSOCKET_CLOSEREASON_NO_REASON then
- *                    no reason is encoded.
- * @param reason_utf8 An UTF-8 encoded text reason why the connection is closed.
- *                    This may be NULL if @a reason_utf8_len is 0.
- *                    This must be NULL if @a reason_code is
- *                    #MHD_WEBSOCKET_CLOSEREASON_NO_REASON (= 0).
- * @param reason_utf8_len The length of the UTF-8 encoded text reason in bytes.
- *                        This may not exceed 123 bytes.
- * @param[out] frame This variable receives a buffer with
- *                   the encoded close frame.
- *                   This is what you typically send via `send()`
- *                   to the recipient.
- *                   If no encoded frame is available this is NULL.
- *                   When this variable is not NULL then the buffer
- *                   contains always @a frame_len bytes plus
- *                   one terminating NUL character.
- *                   The caller must free this buffer
- *                   using #MHD_websocket_free().
- * @param[out] frame_len The length of the result frame buffer in bytes.
- *
- * @return A value of `enum MHD_WEBSOCKET_STATUS`.
- *         This is #MHD_WEBSOCKET_STATUS_OK (= 0) on success
- *         or a value less than 0 on errors.
- * @ingroup websocket
- */
-_MHD_EXTERN enum MHD_WEBSOCKET_STATUS
-MHD_websocket_encode_close (struct MHD_WebSocketStream *ws,
-                            unsigned short reason_code,
-                            const char *reason_utf8,
-                            size_t reason_utf8_len,
-                            char **frame,
-                            size_t *frame_len);
-
-/**
- * Allocates memory with the associated 'malloc' function
- * of the websocket stream
- *
- * @param ws The websocket stream.
- * @param buf_len The length of the memory to allocate in bytes
- *
- * @return The allocated memory on success or NULL on failure.
- * @ingroup websocket
- */
-_MHD_EXTERN void *
-MHD_websocket_malloc (struct MHD_WebSocketStream *ws,
-                      size_t buf_len);
-
-/**
- * Reallocates memory with the associated 'realloc' function
- * of the websocket stream
- *
- * @param ws The websocket stream.
- * @param buf The previously allocated memory or NULL
- * @param new_buf_len The new length of the memory in bytes
- *
- * @return The allocated memory on success or NULL on failure.
- *         If NULL is returned the previously allocated buffer
- *         remains valid.
- * @ingroup websocket
- */
-_MHD_EXTERN void *
-MHD_websocket_realloc (struct MHD_WebSocketStream *ws,
-                       void *buf,
-                       size_t new_buf_len);
-
-/**
- * Frees memory with the associated 'free' function
- * of the websocket stream
- *
- * @param ws The websocket stream.
- * @param buf The previously allocated memory or NULL
- *
- * @return A value of `enum MHD_WEBSOCKET_STATUS`.
- *         This is #MHD_WEBSOCKET_STATUS_OK (= 0) on success
- *         or a value less than 0 on errors.
- * @ingroup websocket
- */
-_MHD_EXTERN int
-MHD_websocket_free (struct MHD_WebSocketStream *ws,
-                    void *buf);
-
-#if 0                           /* keep Emacsens' auto-indent happy */
-{
-#endif
-#ifdef __cplusplus
-}
-#endif
-
-#endif