nginx反向代理丢失端口怎么解决:配置报错 

具体配置如下，访问的时候是8084端口，只要项目里面有重定向，就会变成8081 端口，请问这个配置哪里出问题了呢

upstream lotus_web_test { server 60.205.184.143:8081; }

server {
    listen       8084;
    server_name  localhost;

    location / {
    	proxy_set_header X-Forwarded-Host $host;
    	proxy_set_header X-Forwarded-Server $host;
        proxy_set_header Host $host:8084;
        proxy_set_header X-Real-IP $remote_addr;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
        proxy_buffering off;
        proxy_pass http://lotus_web_test;
    }

    error_page   500 502 503 504  /50x.html;
    location = /50x.html {
        root   html;
    }
}</code></pre>