此篇文章参考：https://www.cnblogs.com/CharmCode/p/13552551.html
首先安装 websockets , 别上来就按照文章一段操作如猛虎，回头一看二百舞 from fastapi import FastAPI, WebSocket, WebSocketDisconnect fastAPI 中的WebSocket也是基于websockets运行的
不安装websockets
前端报错：failed: Error during WebSocket handshake: Unexpected response code: 400后端报错：WARNING: Unsupported upgrade request pip3 install websockets