为啥这个反向代理不成功？

其他我照这写的都没问题啊~~就这个不行~~ 感谢感谢

server
        {
                listen 80;
                server_name therouter.320.io;


                if ($http_user_agent ~* (baiduspider|360spider|haosouspider|googlebot|soso|bing|sogou|yahoo|sohu-search|yodao|YoudaoBot|robozilla|msnbot|MJ12bot|NHN|Twiceler)) {
                return  403;
                }

                location / {
                sub_filter jsjcjsjc.asuscomm.com:50000 therouter.320.io;
                sub_filter_once off;
                proxy_set_header X-Real-IP $remote_addr;
                proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
                proxy_set_header Referer http://jsjcjsjc.asuscomm.com:50000;
                proxy_set_header Host jsjcjsjc.asuscomm.com:50000;
                proxy_pass http://jsjcjsjc.asuscomm.com:50000;
                proxy_set_header Accept-Encoding "";
                }
}