如何在Apache HttpClient中更新请求的目标主机？

CloseableHttpClient httpClient = HttpClients.createDefault();

HttpGet httpGet = new HttpGet("http://oldhost.com/api/endpoint");

HttpHost newHost = new HttpHost("newhost.com", 80, "http");

RequestConfig requestConfig = RequestConfig.custom()
        .setProxy(newHost)
        .build();

httpGet.setConfig(requestConfig);

CloseableHttpResponse response = httpClient.execute(httpGet);

import org.apache.http.HttpHost;
import org.apache.http.client.methods.CloseableHttpResponse;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.client.config.RequestConfig;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClients;

public class HttpClientExample {
    public static void main(String[] args) throws Exception {
        CloseableHttpClient httpClient = HttpClients.createDefault();

        HttpGet httpGet = new HttpGet("http://oldhost.com/api/endpoint");

        HttpHost newHost = new HttpHost("newhost.com", 80, "http");

        RequestConfig requestConfig = RequestConfig.custom()
                .setProxy(newHost)
                .build();

        httpGet.setConfig(requestConfig);

        CloseableHttpResponse response = httpClient.execute(httpGet);

        // 处理响应...

        httpClient.close();
    }
}