Exact format for WebSocket request header?

[3ventic]

@greybeardtv

    client.write('GET / HTTP/1.1\r\n'
                + 'Upgrade:websocket\r\n'
                + 'Connection:Upgrade\r\n'
                + 'Host:' + host + '\r\n'
                + 'Origin:https://www.twitch.tv\r\n'
                + 'Sec-WebSocket-Protocol:irc\r\n'
                + 'Sec-WebSocket-Version:13\r\n'
                +  '\r\n');

The required header you’re missing is Sec-WebSocket-Key. Adding that you should get 101 Switching Protocols. Origin is not necessary, and unnecessarily misleading for the server.