/socket.io/?EIO=3&transport=polling error

[ezemegwara]

i have deployed two applications including this rchat app on Google cloud platform that always have this error and messages cant be sent or received. I am using App engine flex environment, all the codes listed here have been deployed, i can create and account and sign in but cant send or receive messages.

i am new to programming so i dont know what to do, i have done several things i saw on stack overflow and on google but no way

Please help

[Deleted user]

Just built this app locally and discovered that the application.py needs this:
if __name__ == "__main__": app.run(debug=True)

Replaced with this:
if __name__ == "__main__": socketio.run(app, debug=True)
To fix the error.

[G0utham15]

I had some similar issue due to compatibility issues between flask-socketio and the client socketio version and solved by checking version of both that are used.
https://flask-socketio.readthedocs.io/en/latest/#version-compatibility
I hope it helped

[ezemegwara]

Thank you it worked.