http      {        upstream www.test2.com {                  server 10.1.165.36:80  weight = 3;                  server 10.249.198.235;               server 10.1.168.1  down;                server 10.1.168.2  backup;              #ip_hash;         }        server        {              location / {                    proxy_pass        http://www.test2.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;                    }      }