[Net] Fix WebSocketClient path parsing.

Recent changes to parse_url caused the client to make invalid HTTP
requests if no path was specified.

(cherry picked from commit d244dda5970c2aa87bbe3f5468badae5c42b503d)

modules/websocket/websocket_client.cpp

@@ -43,9 +43,9 @@ Error WebSocketClient::connect_to_url(String p_url, const Vector<String> p_proto
 	_is_multiplayer = gd_mp_api;
 
 	String host = p_url;
-	String path = "/";
-	String scheme = "";
-	int port = 80;
+	String path;
+	String scheme;
+	int port = 0;
 	Error err = p_url.parse_url(scheme, host, port, path);
 	ERR_FAIL_COND_V_MSG(err != OK, err, "Invalid URL: " + p_url);
 
@@ -56,6 +56,9 @@ Error WebSocketClient::connect_to_url(String p_url, const Vector<String> p_proto
 	if (port == 0) {
 		port = ssl ? 443 : 80;
 	}
+	if (path.empty()) {
+		path = "/";
+	}
 	return connect_to_host(host, path, port, ssl, p_protocols, p_custom_headers);
 }
 

modules/websocket/wsl_client.cpp

@@ -158,6 +158,7 @@ bool WSLClient::_verify_headers(String &r_protocol) {
 
 Error WSLClient::connect_to_host(String p_host, String p_path, uint16_t p_port, bool p_ssl, const Vector<String> p_protocols, const Vector<String> p_custom_headers) {
 	ERR_FAIL_COND_V(_connection.is_valid(), ERR_ALREADY_IN_USE);
+	ERR_FAIL_COND_V(p_path.empty(), ERR_INVALID_PARAMETER);
 
 	_peer = Ref<WSLPeer>(memnew(WSLPeer));
 	IP_Address addr;