Can swoole use port 80?

vim swotp.liuguofeng.com.conf

server
    {
        listen 80;
        server_name swotp.liuguofeng.com ;
        index index.html index.htm index.php default.html default.htm default.php;
        root  /home/wwwroot/swoole_thinkphp.liuguofeng.com;
        location / {
                if (!-e $request_filename) {
                proxy_pass http://127.0.0.1:8811;
                }
        }
    }