Looks at the response status code and headers in msg and determines if they contain a valid WebSocket handshake response
(given the handshake request in msg's request headers).
If supported_extensions is non-%NULL, extensions included in the response "Sec-WebSocket-Extensions" are verified too.
Accepted extensions are returned in accepted_extensions parameter if non-%NULL.
This is a low-level function; if you use websocket_connect_async to create a WebSocket connection, it will call this for you.
| msg |
Message containing both client and server sides of a WebSocket handshake |
| supported_extensions |
list of supported extension types |
| accepted_extensions |
a List of WebsocketExtension objects |
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