Add the port to the HTTP Host header when needed.

* When the port is not the default one, it must be added to the "Host"
header so the server knows what we're connecting to.

Fixes #11070.

headers/os/net/HttpRequest.h

@@ -81,6 +81,9 @@ private:
 			void				_SetResultStatusCode(int32 statusCode);
 			BString&			_ResultStatusText();
 
+	// Utility methods
+			bool				_IsDefaultPort();
+
 private:
 			BAbstractSocket*	fSocket;
 			BNetworkAddress		fRemoteAddr;