Json上传不适用于三星设备

Question

我使用以下代码将Json对象上传到服务器。

public static User registerUser(User user) {

    HttpClient client = null;

    client = new DefaultHttpClient();
    HttpPost post = new HttpPost(
            "http://www.someurl.com/update/");
    post.setHeader("Accept", "application/json");
    post.setHeader("Content-type", "application/json");

    JSONObject inputJson = new JSONObject();
    try {
        inputJson.put("name", user.getName());
        inputJson.put("username", user.getUsername());
        inputJson.put("email", user.getEmail());
        inputJson.put("gender", user.getGender());
        inputJson.put("location", user.getLocation());
        inputJson.put("password", user.getPassword());
        inputJson.put("deviceId", user.getDeviceId());
        inputJson.put("contactNumber", user.getContactNumber());
        inputJson.put("dateOfBirth", user.getDateOfBirth().getTime());
    } catch (JSONException e) {
        e.printStackTrace();
    }

    String input = inputJson.toString();

    try {
        post.setEntity(new StringEntity(input));
    } catch (UnsupportedEncodingException e1) {
        // handle exception
        Log.d("registrattion", e1.getMessage());
    }

    HttpResponse response = null;

    try {
        response = client.execute(post);
        Log.d("upload", "write");
    } catch (IOException e) {
        // handle exception
        e.printStackTrace();
    }

    Log.d("res", response.getStatusLine().toString());

    return user;
}

服务器未检测到任何Json调用。该代码适用于HTC和Lenovo设备。它也适用于华为设备，这是我国最常用的设备。它不适用于三星设备。可能是什么问题？