http://www.cnblogs.com/TankXiao/archive/2012/12/12/2794160.html
https://blog.csdn.net/xiaoxiaorenky/article/details/6229734 good
https://blog.csdn.net/michealcxt/article/details/22939239
https://blog.csdn.net/zhyh1435589631/article/details/51623099 good
https://www.cnblogs.com/vipyoumay/archive/2017/08/31/7455431.html good
https://www.cnblogs.com/Anker/p/6056540.html good
HTTP代理服务器基本知识
原文地址：https://www.cnblogs.com/fengff/p/9026614.html