无法从HttpClient获得完整的HTTP响应

我似乎没有从httpclient获得整个json响应。我碰到了我正在本地运行的api，如下所示：

curl -i -X POST http://localhost:8098/<api location> -F "files=@<filename>"

我的回答如下：

{"data":[<bunch of json>]

但是，当我尝试使用httpclients发布完全相同的文件时，得到以下响应：

{"data":[]}

我究竟做错了什么？这是我的Java代码。谢谢！

public CloseableHttpResponse submit (File file) throws IOException {
    CloseableHttpClient client = HttpClients.createDefault();
    HttpPost post = new HttpPost(API_LOCATION + API_BASE);
    MultipartEntityBuilder builder = MultipartEntityBuilder.create();
    builder.addBinaryBody("ISO xml file", file, ContentType.APPLICATION_OCTET_STREAM, file.getName());
    HttpEntity multipartEntity = builder.build();
    post.setEntity(multipartEntity);

    CloseableHttpResponse response = client.execute(post);
    System.out.println("response: " + IOUtils.toString(response.getEntity().getContent(),"UTF-8"));
    client.close();
    return response;
}