nginx基本配置和参数说明 http://www.nginx.cn/76.html
nginx反响代理 https://www.cnblogs.com/ysocean/p/9392908.html
https://zhuanlan.zhihu.com/p/87772571
反响代理获取真实ip https://www.cnblogs.com/Nedved/p/10472464.html
nignx转发tcp和udp https://www.vpstry.com/archives/351.html