设置“主机"Spring RestTemplate 的标头不起作用

我想使用 Spring RestTemplate，通过 交换 方法.

I want to send an HTTP request using Spring RestTemplate, via the exchange method.

第三个参数是 HttpEntity 的一个实例，它允许设置请求的头部/主体.我尝试了以下代码片段:

The third parameter is an instance of HttpEntity, which allows setting the headers/body of the request. I tried the following code snippet:

import org.springframework.http.*;
import org.springframework.web.client.RestTemplate;

public class Connector {
    public static void main(String[] args) {

        HttpHeaders headers = new HttpHeaders();
        headers.set("Host", "www.example.com");
        headers.set("User-Agent", "whatever");


        RestTemplate restTemplate = new RestTemplate();

        ResponseEntity<String> responseEntity = restTemplate.exchange(
                "http://httpbin.org/headers", HttpMethod.GET,
                new HttpEntity<String>(null, headers), String.class);

        System.out.println(responseEntity.getBody());
    }
}

请注意，http://httpbin.org/headers 是一个简单的 HTTP 请求 &响应服务，(在本例中)返回 HTTP 标头.

Notice that http://httpbin.org/headers is a simple HTTP Request & Response Service, which (in this case) returns HTTP headers.

运行Java代码的结果如下:

The result of running the Java code is as follows:

{
  "headers": {
    "Accept": "text/plain, */*", 
    "Connection": "close", 
    "Host": "httpbin.org", 
    "User-Agent": "whatever"
  }
}

如您所见，User-Agent 设置为我想要的，但 Host 不是.

As you can see, the User-Agent is set to what I wanted, but the Host is not.

如何将 Host 设置为我想要的值?

How can I set Host to the value I desire?