Python WebSocket not working

Question

I tried to implement my first websocket example but I cannot make it work.

I use a python webserver:

import threading
import socket

def start_server():
         


        

Answer 1

You're responding with the older Hixie 75 protocol but the client only speaks the newer HyBi/IETF RFC 6455 WebSocket protocol.

Your response to the handshake should look more like this (the accept value is calculated from the key value from the client):

HTTP/1.1 101 Switching Protocols
Upgrade: websocket
Connection: Upgrade
Sec-WebSocket-Accept: s3pPLMBiTxaQ9kYGzzhZRbK+xOo=

In HyBi/6455, the frames are no longer delimited with \x00 and \xff. Instead there is a header to every frame that contains several pieces of data including frame type and payload length.

See the spec for more information. Or better yet, you could refer and/or use an existing python WebSocket implementation such as pywebsocket, tornado, or my own project websockify which contains websocket.py which is a generic websocket server lib.