nginx隐藏端口号

在做Nginx反向代理时遇到个很烦人的问题，总是要显示端口号，查找了下终于找到解决办法

   server {  
       listen       80;  
       server_name  localhost;  
	   proxy_set_header Host $host:$server_port;  
       proxy_set_header X-Real-IP $remote_addr;  
       proxy_set_header REMOTE-HOST $remote_addr;  
       proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;  
		location / {  
		proxy_pass http://127.0.0.1:8080/;  
       }  
   }  

proxy_set_header Host $host:$server_port;  这段比较关键之前我没加$server_port就老是到下级请求出现真实端口号。