title: android JsonObjectRequest error
body: <p>I try that my application was linked with ms outlook.
  I complete ms login, then have to get outlook calendar id. In ms develop page, 
  they asked me to send a http request to "<a href="https://graph.microsoft.com/v1.0/me/calendar" rel="nofollow noreferrer">https://graph.microsoft.com/v1.0/me/calendar</a>" </p>
  
  <p>I am getting:</p>
  
  <blockquote>
    <p>com.android.volley.NoConnectionError: java.net.UnknownHostException: Unable to resolve host "graph.microsoft.com": No address associated with hostname</p>
  </blockquote>
  
  <pre><code>String url = "https://graph.microsoft.com/v1.0/me/calendar";
  final TextView textView = (TextView)findViewById(R.id.getcalendar);
  
  
  RequestQueue queue = Volley.newRequestQueue(this);
  JSONObject parameters = new JSONObject();
  JsonObjectRequest jsObjRequest = new JsonObjectRequest
                          (Request.Method.GET, url, parameters, new Response.Listener&lt;JSONObject&gt;() {
  
                              @Override
                              public void onResponse(JSONObject response) {
                                  textView.setText("Response: " + response.toString());
                                  Log.i("in onresponse","gdgd");
                              }
          }, new Response.ErrorListener() {
  
              @Override
              public void onErrorResponse(VolleyError error) {
                  // TODO Auto-generated method stub
                  Log.d("onErrorResponse", "Error: " + error.toString());
  
              }
          }) {
      @Override
      public Map&lt;String, String&gt; getHeaders() throws AuthFailureError {
          Map&lt;String, String&gt; headers = new HashMap&lt;&gt;();
          headers.put("Authorization", "Bearer ");
          return headers;
      }
  };
  jsObjRequest.setRetryPolicy(new DefaultRetryPolicy(
          3000,
          DefaultRetryPolicy.DEFAULT_MAX_RETRIES,
          DefaultRetryPolicy.DEFAULT_BACKOFF_MULT));
  queue.add(jsObjRequest);
  </code></pre>