如何使用nginx做反向代理配置

upstream cache_server {
    server 源ip位址:80;
}

server {
    listen 80;
    server_name www.xx.com  m.xx.com;
    location / {
        proxy_redirect off;
        proxy_set_header Host $host;
        proxy_set_header X-Real-IP $remote_addr;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
        proxy_pass http://cache_server;
    }
    access_log off;
}