使用Apache库的HttpPost Java

Question

我正在尝试在向其发送json文件后从服务器获得确认响应。我无法看到以下问题。尝试连接服务器时，我一直遇到502错误。

感谢您的帮助！

    HttpClient client = new DefaultHttpClient();
    HttpPost post = new HttpPost("https://stage-api.e-signlive.com/aws/rest/services/codejam");
    post.setHeader("Authorization", "Basic Y29kZWphbTpBRkxpdGw0TEEyQWQx");
    post.setHeader("Content-Type", "application/json");

    File file = new File("test.json");

    try{
        post.setEntity(new FileEntity(file, "application/json"));

        HttpResponse response = client.execute(post);
        BufferedReader rd = new BufferedReader(new InputStreamReader(response.getEntity().getContent()));

        String line = "";
        while ((line = rd.readLine()) != null){
            System.out.println(line);
        }
        //System.out.println(response.getStatusLine().getStatusCode());
    }
    catch (IOException e){
        e.printStackTrace();
    }