原因： 1、都采用 `http1.1` 2、`http1.0`默认开启`kee-alive`,而`http1.1`是默认不开启`keep-alive` 操作如下： ``` location ^~ /xxxxxx/ { ... proxy_http_version 1.1; proxy_set_header Connection "Keep-Alive"; ... } ``` 学习文章来源：https://xiezefan.me/2017/09/27/nginx-502-bug-trace/