I was was having problems receiving data from a client using POST with chunked encoding.

It turns out this client is violating the HTTP spec by setting the "Transfer-Encoding: Chunked"
as well as "Content-Length: 0"

Here are the client headers:
  POST /ee4/live.isml/Streams(Encoder1) HTTP/1.1
  Transfer-Encoding: Chunked
  User-Agent: ExpressionEncoder
  Host: 10.11.1.29
  Content-Length: 0
  Connection: Keep-Alive
  Cache-Control: no-cache

This is what HTTP 1.1 spec says (in section 4.4):
  Messages MUST NOT include both a Content-Length header field and a non-identity transfer-coding. If the message does include
  a non- identity transfer-coding, the Content-Length MUST be ignored.

libmicrohttpd does the opposite of what the 4.4 section says if both headers are present.  It only uses the content-length and ignores the
chunked encoding.
I patched libmicrohttpd with the attached patch that does the opposite.  It ignores the content-length if chunked encoding is also specified.
And with that patch libmicrohttpd can be a publishing point for MS Expression Encoder.

What is your take on this?

-eivind
=> answer: follow the spec ;-)

ChangeLog

@@ -1,3 +1,7 @@
+Tue Dec 18 21:18:11 CET 2012
+	Given both 'chunked' encoding and 'content-length',
+	ignore the 'content-length' header as per RFC. -ES
+
 Thu Dec  6 10:14:44 CET 2012
 	Force adding "Connection: close" header to response if
 	client asked for connection to be closed (so far, we

src/daemon/connection.c

@@ -1836,40 +1836,36 @@ parse_connection_headers (struct MHD_Connection *connection)
       return;
     }
 
-  clen = MHD_lookup_connection_value (connection,
-                                      MHD_HEADER_KIND,
-                                      MHD_HTTP_HEADER_CONTENT_LENGTH);
-  if (clen != NULL)
+  connection->remaining_upload_size = 0;
+  enc = MHD_lookup_connection_value (connection,
+				     MHD_HEADER_KIND,
+				     MHD_HTTP_HEADER_TRANSFER_ENCODING);
+  if (enc != NULL)
     {
-      cval = strtoul (clen, &end, 10);
-      if ( ('\0' != *end) ||
-	 ( (LONG_MAX == cval) && (errno == ERANGE) ) )
+      connection->remaining_upload_size = MHD_SIZE_UNKNOWN;
+      if (0 == strcasecmp (enc, "chunked"))
+        connection->have_chunked_upload = MHD_YES;
+    }
+  else
+    {
+      clen = MHD_lookup_connection_value (connection,
+					  MHD_HEADER_KIND,
+					  MHD_HTTP_HEADER_CONTENT_LENGTH);
+      if (clen != NULL)
         {
+          cval = strtoul (clen, &end, 10);
+          if ( ('\0' != *end) ||
+	     ( (LONG_MAX == cval) && (errno == ERANGE) ) )
+            {
 #if HAVE_MESSAGES
-          MHD_DLOG (connection->daemon,
+              MHD_DLOG (connection->daemon,
                     "Failed to parse `%s' header `%s', closing connection.\n",
                     MHD_HTTP_HEADER_CONTENT_LENGTH, clen);
 #endif
-	  CONNECTION_CLOSE_ERROR (connection, NULL);
-          return;
-        }
-      connection->remaining_upload_size = cval;
-    }
-  else
-    {
-      enc = MHD_lookup_connection_value (connection,
-					 MHD_HEADER_KIND,
-					 MHD_HTTP_HEADER_TRANSFER_ENCODING);
-      if (NULL == enc)
-        {
-          /* this request (better) not have a body */
-          connection->remaining_upload_size = 0;
-        }
-      else
-        {
-          connection->remaining_upload_size = MHD_SIZE_UNKNOWN;
-          if (0 == strcasecmp (enc, "chunked"))
-	    connection->have_chunked_upload = MHD_YES;
+	      CONNECTION_CLOSE_ERROR (connection, NULL);
+              return;
+            }
+          connection->remaining_upload_size = cval;
         }
     }
 }

src/include/microhttpd.h

@@ -106,7 +106,7 @@ extern "C"
 /**
  * Current version of the library.
  */
-#define MHD_VERSION 0x00091701
+#define MHD_VERSION 0x00091702
 
 /**
  * MHD-internal return code for "YES".