title: Add custom headers in volley request
body: <p>I have a Volley Request code</p>
  
  <pre><code>RequestQueue queue = Volley.newRequestQueue(this);
  String url =&lt;My URL&gt;;
  
  // Request a string response from the provided URL.
  StringRequest stringRequest = new StringRequest(Request.Method.GET, url,
              new Response.Listener&lt;String&gt;() {
      @Override
      public void onResponse(String response) {
          // Display the first 500 characters of the response string.
          mTextView.setText("Response is: "+ response.substring(0,500));
      }
  }, new Response.ErrorListener() {
      @Override
      public void onErrorResponse(VolleyError error) {
          mTextView.setText("That didn't work!");
      }
  });
  // Add the request to the RequestQueue.
  queue.add(stringRequest);
  </code></pre>
  
  <p>How do I set a header called Authorization in this??</p>