Graceful close is not implemented for sockets on Windows

On Windows, whenever a close occurs, the socket is just closed even though it should be shutdown gracefully. This can cause problems if you try to connect to a http server only for it to give an error code and a message to go with it. In this case the connection should be kept alive long enough so that the message can be read before the connection gets closed.

Since the data is discarded whenever a connection is closed in Qt then it will not get the chance to read this data as no graceful close was done.