报错
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)
解决方案
pip install Flask-SocketIO==4.3.1 pip install python-engineio==3.13.2 pip install python-socketio==4.6.0
或者
pip install flask-socketio==4.0.0
pip install python-socketio==4.0.1
pip install python-engineio==3.2.0
from：https://blog.csdn.net/piaopu0120/article/details/115462422