对端点的同步POST不会发布数据 - java

Question

我正在尝试向端点发送同步POST，如下所示：

但似乎我的httpClinet发布了一个空白数据。我在这里做错了什么？

这是httpClinetPost postTo实现：

public static String postTo(String stringToPass) 
{
   HttpClient httpClient = HttpClientBuilder.create().build();
    HttpPost request = new HttpPost(some url);
    request.setEntity(new ByteArrayEntity(stringToPassing);
    HttpResponse response = httpClient.execute(request);
    int res = response.getStatusLine().getStatusCode();

    if (res == 401) {
        throw new IOException(res);
    } else if (res != 200) {
        throw new IOException(res);
    }

    String responseString = EntityUtils.toString(response.getEntity());