如何在Spring Boot HttpHeaders中添加带有<String，Integer>的自定义头部？

HttpHeaders headers = new HttpHeaders();

headers.set("Custom-Header", "value");

headers.add("Custom-Header", "value");

HttpEntity<String> requestEntity = new HttpEntity<>(headers);

import org.springframework.http.HttpEntity;
import org.springframework.http.HttpHeaders;
import org.springframework.http.HttpMethod;
import org.springframework.http.ResponseEntity;
import org.springframework.web.client.RestTemplate;

public class CustomHeaderExample {
    public static void main(String[] args) {
        // 创建一个HttpHeaders对象
        HttpHeaders headers = new HttpHeaders();

        // 添加自定义头部
        headers.add("Custom-Header", "value");

        // 创建一个HttpEntity对象，并将自定义头部添加到请求中
        HttpEntity<String> requestEntity = new HttpEntity<>(headers);

        // 发送请求
        RestTemplate restTemplate = new RestTemplate();
        ResponseEntity<String> responseEntity = restTemplate.exchange(
                "http://example.com/api/endpoint",
                HttpMethod.GET,
                requestEntity,
                String.class);

        // 处理响应
        String responseBody = responseEntity.getBody();
        System.out.println(responseBody);
    }
}