Python Heroku Configure Procfile Gunicorn + Gevent For Socket.io Chat App | Runtimeerror: You Need To Use The Gevent-websocket Server

I have a working chat app on localhost, but it does not work on heroku (Question from yesterday). After some research I think the problem is how I start the app. Procfile currentl

Solution 1:

The error is correct, you need to use the gevent-websocket webserver and not the native gevent web server that comes with gunicorn.

It seems you are searching for answers all over the place. I would suggest that you use the Flask-SocketIO documentation as the ultimate source of truth, as I keep that updated.

For this specific case, the Gunicorn section of the documentation shows you how you need to start your server:

gunicorn -k geventwebsocket.gunicorn.workers.GeventWebSocketWorker -w 1module:app