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I am currently trying to connect server and client with flask_socketio, python-engineio and python-socketio. However, I'm getting the following error and I tried many solutions from here but it still doesn't work

On the server:

The client is using an unsupported version of the Socket.IO or Engine.IO protocols (further occurrences of this error will be logged with level INFO)

On the client:

WARNING:socketIO-client:127.0.0.1:8081/socket.io [engine.io waiting for connection] unexpected status code (400 "The client is using an unsupported version of the Socket.IO or Engine.IO protocols")

My currently config:

python-engineio==4.3.3 python-socketio==5.7.1 Flask-SocketIO==5.2.0

How can I fix this? Thank you guys

HTL
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  • You have not indicated what version are you using for the client, which is the most important detail, since the error is about the client using a version that is unsupported by the server. – Miguel Grinberg Nov 08 '22 at 10:39
  • @MiguelGrinberg I used the same version for both clients and server – HTL Nov 14 '22 at 05:49
  • What client are you using? The error message does not look like it is coming from a Python based client. If you are not using a Python client, then your claim that "it is the same version" cannot be accurate, since version numbering schemes are completely different across different implementations of the protocol. – Miguel Grinberg Nov 15 '22 at 10:50

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