WebSocket协议

ref

https://www.ruanyifeng.com/blog/2017/05/websocket.html

https://www.cnblogs.com/chyingp/p/websocket-deep-in.html

https://www.cnblogs.com/LiPengFeiii/p/15946736.html

https://juejin.cn/post/6989539483695710215

https://zhuanlan.zhihu.com/p/97883095

打开网页是TCP还是UDP