使用场景：

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需要根据截取URL动态配置跳转路径，常见于访问内网不固定ip地址的文件图片，

请求地址：http://11.19.1.212:82/bimg4/32.52.62.42:222/DownLoadFile?filename=LOC:12/data/20180208/15/2e0ae54dfd752210083404deed15269c_222403

实际需要访问的内网地址：http://32.52.62.42:222/DownLoadFile?filename=LOC:12/data/20180208/15/2e0ae54dfd752210083404deed15269c_222403

nginx配置文件

server {
  listen 83;
  server_name localhost;
  index index.html index.htm;

  root D: /workspace-xxxx/xxx_Web;

  error_page 500 502 503 504 / 50x.html;
  location = /50x.html {
      root  html;
    }
  location ^~ /xxx/ {
    proxy_pass http: //192.168.60.36:8090/xxxx/;
    proxy_redirect default;
    proxy_set_header Host $host;
    proxy_set_header X - Real - IP $remote_addr;
    proxy_set_header X - Forwarded - Host $host;
    proxy_set_header X - Forwarded - Server $host;
    proxy_set_header X - Forwarded - For $proxy_add_x_forwarded_for;
    proxy_set_header Upgrade $http_upgrade;
    proxy_set_header Connection "Upgrade";
  }

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