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
文章乃参考、转载其他博客所得，仅供自己学习作笔记使用！！！
Original: https://www.cnblogs.com/xuan52rock/p/15481440.html
Author: 神奇的旋风
Title: 【转】flask-socketio的版本问题
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