如何确保抛出HttpClientErrorException会导致HTTP400响应？

import org.springframework.http.HttpMethod;
import org.springframework.http.ResponseEntity;
import org.springframework.web.client.HttpClientErrorException;
import org.springframework.web.client.RestTemplate;

public class HttpClientExample {
    public static void main(String[] args) {
        RestTemplate restTemplate = new RestTemplate();
        String url = "https://api.example.com/resource";
        
        try {
            ResponseEntity<String> response = restTemplate.exchange(url, HttpMethod.GET, null, String.class);
            // 处理正常响应
        } catch (HttpClientErrorException ex) {
            if (ex.getStatusCode().is4xxClientError()) {
                // 处理HTTP 400错误
            } else {
                // 处理其他异常
            }
        }
    }
}