-add Sec-WebSocket-Protocol to header only if it exists in request header
-add Sec-WebSocket-Protocol to header only if it exists in request header

malefice/django-websocket-redis,jgroszko/django-websocket-redis,jrief/django-websocket-redis,jgroszko/django-websocket-redis,jrief/django-websocket-redis,malefice/django-websocket-redis