好的，我想看看如何为PHP服务器设置nginx反向代理。请使用json格式，每个设置项为一个对象，关键字为 "Setting"、"Value" 和 "Description"。字数在20字以内。所有设置项放在一个名为 "ProxySettings" 的对象中。
user
```json
{
  "ProxySettings": [
    {
      "Setting": "server_name",
      "Value": "example.com",
      "Description": "设置服务器名"
    },
    {
      "Setting": "proxy_pass",
      "Value": "http://127.0.0.1:8080",
      "Description": "指定代理地址"
    },
    {
      "Setting": "proxy_set_header",
      "Value": "Host $host",
      "Description": "设置请求头"
    }
  ]
}
```
assistant