Java Http-Post头内容-长度

Question

我的HTTP头有问题。我需要发送一个带有空正文和标题“content-length：0”的post-request。但这似乎是不可能的，因为我有一个例外：

--org.apache.http.ProtocolException：内容长度头已存在--

HttpClient client = HttpClientBuilder.create().build();
HttpPost httpPost = new HttpPost(url);
httpPost.addHeader(header..);
httpPost.addHeader(another header);
httpPost.addHeader("Content-Type","application/xml");
httpPost.addHeader("Content-Length","0");
httpPost.addHeader(another header);
HttpResponse response = client.execute(httpPost);
System.out.println(response.getStatusLine().getStatusCode());

编辑：

用@Beno Arakelyan的答案解决了这个问题。

Answer 1

我尝试用构建在apache http客户端上的http-request发送content-lengts。工作很好。示例：

private static final HttpRequest<?> HTTP_REQUEST =
      HttpRequestBuilder.createGet(YOUR_URI)
        .addDefaultHeader(HttpHeaders.CONTENT_LENGTH, "0")
        .build();

public void test(){
  System.out.println(HTTP_REQUEST.execute().getStatisCode()); // is 200
}