When using Pagoda as a reverse proxy, how does PHP obtain the domain name of the source site?

Website: 4s5.cn

Now, I would like to access the website at 123.4s5.cn using a reverse proxy.

My current plan is to use the PHP script from 4s5.cn to retrieve the domain name 123.4s5.cn!

After extensive research, I finally discovered that when configuring reverse proxy rules, you can simply set up a rule to forward requests for 123.4s5.cn!

location / {
    proxy_pass http://4s5.cn;
    proxy_set_header Host $host;
    proxy_set_header X-Real-IP $remote_addr;
    proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;

    # 将 123.4s5.cn 作为请求头信息传递给目标服务器
    proxy_set_header X-Real-Domain "123.4s5.cn";
  }

Print directly in PHP即可看到你传递的值了！

$_SERVER