1.
https://zhuanlan.zhihu.com/p/37350346?utm_source=qq&utm_medium=social&utm_oi=69933966819328
https://www.cnblogs.com/chyingp/p/websocket-deep-in.html
https://developer.mozilla.org/en-US/docs/Web/API/WebSockets_API/Writing_WebSocket_server
python client
https://github.com/websocket-client/websocket-client