============【HTTP短连接与长连接】======================
参考链接:HTTP长连接、短连接究竟是什么?:https://www.cnblogs.com/blogtech/p/10981606.html网络连接中的长连接和短链接是什么意思?:https://www.zhihu.com/question/22677800HTTP的长连接和短连接:https://www.cnblogs.com/cswuyg/p/3653263.html