Function std::ws_is_upgrade
int ws_is_upgrade(const &HttpRequest req)1 if 'req' asks for a WebSocket upgrade (GET with Upgrade: websocket, Connection: upgrade and a Sec-WebSocket-Key).
int ws_is_upgrade(const &HttpRequest req)1 if 'req' asks for a WebSocket upgrade (GET with Upgrade: websocket, Connection: upgrade and a Sec-WebSocket-Key).