upstream xxxOrderServer{
           server 127.0.0.1:9005 weight=100;
           server 127.0.0.1:9006 weight=100;
    }

    server {
        listen       80;
        server_name  xxx.com;
    add_header backendIP $upstream_addr;
    add_header backendCode $upstream_status;


        location ^~ /xxxOrder {
          proxy_pass http://xxxOrderServer/yyyy/zzzz;
          proxy_set_header  X-Real-IP  $remote_addr;
          proxy_set_header  X-Forwarded-For  $proxy_add_x_forwarded_for;
          proxy_set_header  Host  $http_host;
          proxy_read_timeout       300;
          proxy_send_timeout       600;
          proxy_ignore_client_abort on;
          proxy_connect_timeout    300;
      proxy_next_upstream     error;
         }
    }