很全面的http协议解析:
https://blog.csdn.net/qq_32534441/article/details/88684048
一次完整的HTTP请求过程:
https://blog.csdn.net/qq_32534441/article/details/88684100
完整的HTTP请求会经历以下过程:
https://blog.csdn.net/qq_32534441/article/details/88690810
从输入url到获取页面的完整过程:
https://blog.csdn.net/u012680593/article/details/52629635