急，关于 nginx 反代集群问题， nginx——3 台 tomcat。

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tomcat 是 192.168.0.242:18001/index.action 的服务。直接访问 tomcat 地址没事。

upstream tomcat {

  server 192.168.0.242:18001; 
  server 192.168.0.242:18002;
  server 192.168.0.242:18003; 
 }

server { listen 80; server_name localhost; access_log logs/access.log; location / {

            proxy_set_header Host $proxy_host;
            proxy_set_header         REMOTE-HOST $remote_addr;
            proxy_set_header         X-Real-IP $remote_addr;
            proxy_set_header         X-Forwarded-For $proxy_add_x_forwarded_for;
            proxy_pass               http://tomcat;
            client_max_body_size     10m;
            client_body_buffer_size  256k;
            proxy_connect_timeout    600;
            proxy_send_timeout       600;
            proxy_read_timeout       600;
            proxy_buffer_size        32k;
            proxy_buffers            4 64k;
            proxy_busy_buffers_size  128k;
            proxy_temp_file_write_size 512k;

}

然而访问我 localhost，却自动跳转 tomcat/index.action 报错。我该怎么访问 tomcat 集群。