快速入门网络协议 & C/S模式
老话说得好，站在巨人的肩膀上
https://www.ruanyifeng.com/blog/2012/05/internet_protocol_suite_part_i.html
https://www.ruanyifeng.com/blog/2012/06/internet_protocol_suite_part_ii.html
https://github.com/astaxie/build-web-application-with-golang/blob/master/zh/03.1.md
