Apache HTTP：如何设置自定义 ContentType

Question

我正在使用 apache http 客户端将文件上传为

public void whenSendMultipartRequestUsingHttpClient_thenCorrect() 
  throws ClientProtocolException, IOException {
    CloseableHttpClient client = HttpClients.createDefault();
    HttpPost httpPost = new HttpPost("http://www.example.com");

    MultipartEntityBuilder builder = MultipartEntityBuilder.create();
    builder.addTextBody("ads", "John");
    builder.addTextBody("qwe", "pass");
    builder.addBinaryBody("file", new File("test.txt"),
      ContentType.APPLICATION_OCTET_STREAM, "file.ext");

    HttpEntity multipart = builder.build();
    httpPost.setEntity(multipart);

    CloseableHttpResponse response = client.execute(httpPost);
    assertThat(response.getStatusLine().getStatusCode(), equalTo(200));
    client.close();
}

问题是服务器端需要文件的ContentType为application/myCustomTag

但是，这不是ContentType 接口中的值。我有什么办法可以提供一个自定义字符串为ContentType？

编辑

我尝试重新创建在浏览器上看到的请求

我的请求标头为

[X-head1: {someJson}, Accept: application/json, X-head2: someVal, X-head3: otherVal, Content-Type: application/json]

和有效载荷

[Content-Disposition: form-data; name="file.ext"; filename="test.txt", Content-Type: application/octet-stream, Content-Transfer-Encoding: binary]

我可以看到的主要区别是，在有效负载中，我在浏览器中看到以下内容

Content-Type: application/myCustomTag

这不是 HTTP 标准 Content-Type 所以我不能这样设置

Answer 1

您在 HttpPost 上尝试过 setHeader 吗？ API here

替代方案：

ContentType.create("application/myCustomTag")