此请求错误已拒绝授权

Question

我使用授权令牌访问JSON api Web服务。我使用下面的代码尝试这样做，并在Q标题中返回此错误，因此有人可以帮我提供示例代码的分步解决方案：

以下是我致电的网络服务链接： http://api.nokhbatalatbaq.com/api/Packages/1/Comments

public class CommentsAsyncTask extends AsyncTask<String, Void, String> {

HttpURLConnection httpcon;
String url = null;
String data = null;
String   results = null;
Activity a ;

private final WeakReference<Activity> activityWeakRef;
Throwable error;

public CommentsAsyncTask(Activity context,String url) {
    this.activityWeakRef = new WeakReference<Activity>(context);
    this.a=context;
    this.url=url;
}

@Override
protected void onPreExecute() {
    super.onPreExecute();
}

@Override
protected String doInBackground(String... urls) {

    HttpClient client = new DefaultHttpClient();
    HttpPost request = new HttpPost("http://api.nokhbatalatbaq.com/api/Packages/1/Comments" );
    request.setHeader("Content-type", "application/x-www-form-urlencoded");
    String requestBody ="access_token=<OMITTED>&username=<OMITTED>&userID=3&issued=Sun, 14 Feb 2016 05:31:18 GMT&expires=Sun, 28 Feb 2016 05:31:18 GMT";

    try {
        request.setEntity(new StringEntity(requestBody));
    } catch (UnsupportedEncodingException e) {
        e.printStackTrace();  //To change body of catch statement use File | Settings | File Templates.
    }

/* Checking response */
    try {
        HttpResponse response = client.execute(request);
         results = "ERROR";
        results = EntityUtils.toString(response.getEntity());
        Log.d("STACK", "Response::" + results);
    } catch (IOException e) {
        e.printStackTrace();  //To change body of catch statement use File | Settings | File Templates.
    }

    return results;
}




@Override
protected void onPostExecute(String result) {
    super.onPostExecute(result);


    Log.d("error", result);
    Toast.makeText(a, result,
            Toast.LENGTH_LONG).show();


}