nginx针对请求的uri来代理

        场景：1台nginx去代理4台apache

        需求：根据不同的请求uri 代理到不同的apache

        nginx的配置文件为：

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upstream aa.com { 
                  server 192.168.0.121;
                  server 192.168.0.122; 
  }
upstream bb.com { 
                  server 192.168.0.123;
                  server 192.168.0.124;
    }
server {
    listen 80;
    server_name www.abc.com;
    location ~ aa.php
    {
        proxy_pass http://aa.com/;
        proxy_set_header Host $host;
        proxy_set_header X-Real-IP $remote_addr;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
    }
    location ~ bb.php
    {
        proxy_pass http://bb.com/;
        proxy_set_header Host $host;
        proxy_set_header X-Real-IP $remote_addr;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
    }
}