通信协议

OSI七层模型与TCP/IP五层模型

https://www.cnblogs.com/qishui/p/5428938.html

网络分层模型OSI和TCP/IP四层模型

https://blog.csdn.net/andrewgithub/article/details/81603205

socket通信处于网络协议那一层和两种接收发送消息方式

https://blog.csdn.net/jia12216/article/details/82702960

WebSocket 和socket、HTTP的区别和联系

https://blog.csdn.net/SL_ideas/article/details/73648378?utm_medium=distribute.pc_aggpage_search_result.none-task-blog-2~all~first_rank_v2~rank_v25-1-73648378.nonecase&utm_term=websocket%E5%B1%9E%E4%BA%8E%E5%93%AA%E4%B8%80%E5%B1%82

看完让你彻底搞懂Websocket原理

https://cloud.tencent.com/developer/article/1148216