1. 代码解释 
   1.1 http:www.baidu.test.com默认是80，访问“/”利用反向代理，然后访问本地8083； 
   1.2 8083代表本地的前端工程访问地址，前端需要访问后台数据，”/”,继续代理到后台地址9803； 
   1.3 这样就做到了只要开通80端口就可以完成多个端口访问。 
   1.4 root配置可以是绝对路径，也可是相对路径。

server {        listen       80;        server_name  www.baidu.test.com;#你要填写的域名，多个用逗号隔开        location / {            proxy_pass  http://localhost:8083;              proxy_set_header Host $host;              proxy_set_header X-Real-IP $remote_addr;              proxy_set_header X-Forwarded-For  $proxy_add_x_forwarded_for;              root   /app/esop_web/esopschool;            index  index.html;            try_files $uri $uri/ /index.html;        }        location /rest{            proxy_pass http://localhost:9803;             proxy_set_header   Host    $host;             proxy_set_header   X-Real-IP   $remote_addr;             proxy_set_header   X-Forwarded-For $proxy_add_x_forwarded_for;         }    }