反向代理配置：

server {
    listen 80;
    server_name mirrors.maqian.work;

    location / {
        proxy_pass http://mirrors.aliyun.com;
        proxy_redirect off;
        proxy_set_header Host $proxy_host;
        proxy_set_header X-Real-IP $remote_addr;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
    }
}

在浏览器访问mirrors.maqian.work时：

• $host: mirrors.maqian.work
• $proxy_host: mirrors.aliyun.com