nginx负载均衡 proxy_set_header的简单配置
https://blog.csdn.net/cominglately/article/details/85302678
java nginx socket tcp转发 用户真实IP
https://blog.csdn.net/vsixkang/article/details/81475340
21、nginx之ngx_http_proxy_module模块
https://www.cnblogs.com/LiuChang-blog/p/12494587.html
20、nginx之ngx_http_upstream_module模块
https://www.cnblogs.com/LiuChang-blog/p/12494567.html
proxy protocol介绍及nginx配置
https://www.jianshu.com/p/cc8d592582c9