如何在上传文件时从HttpEntity中移除请求头

import org.apache.http.HttpEntity;
import org.apache.http.HttpHeaders;
import org.apache.http.HttpResponse;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.entity.ContentType;
import org.apache.http.entity.mime.MultipartEntityBuilder;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClients;

import java.io.File;
import java.io.IOException;

public class FileUploadExample {
    public static void main(String[] args) {
        CloseableHttpClient httpClient = HttpClients.createDefault();
        HttpPost httpPost = new HttpPost("http://example.com/upload");

        // 创建MultipartEntityBuilder对象
        MultipartEntityBuilder builder = MultipartEntityBuilder.create();

        // 添加文件
        File file = new File("path/to/file");
        builder.addBinaryBody("file", file, ContentType.DEFAULT_BINARY, file.getName());

        // 设置请求体的边界
        builder.setBoundary("my_boundary");

        // 构建HttpEntity对象
        HttpEntity entity = builder.build();

        // 设置请求的实体部分
        httpPost.setEntity(entity);

        try {
            // 发送请求
            HttpResponse response = httpClient.execute(httpPost);
            // 处理响应
            // ...
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}