title: Unexpected response code 503 for Volley string request (using Amazon Web Service)
body: <p>I'm making a string request with Volley. Here's the error:</p>
  
  <blockquote>
    <p>basicNetwork.performRequest: Unexpected response code 503 for http://...</p>
  </blockquote>
  
  <p>The problem is not the url. I've checked that already. The url is an address to some XML that looks like this for example:</p>
  
  <pre><code>    &lt;config&gt;
          &lt;Request name="ValidateEmailRequest"&gt;
              &lt;requestqueue&gt;emailrequest&lt;/requestqueue&gt;
              &lt;responsequeue&gt;emailresponse&lt;/responsequeue&gt;
          &lt;/Request&gt;
          &lt;Request name="CleanEmail"&gt;
              &lt;requestqueue&gt;Cleanrequest&lt;/requestqueue&gt;
              &lt;responsequeue&gt;Cleanresponse&lt;/responsequeue&gt;
          &lt;/Request&gt;
      &lt;/config&gt;
  </code></pre>
  
  <p>Here is my request code:</p>
  
  <pre><code>StringRequest myReq = new StringRequest(
  
      Request.Method.GET, 
      url,
  
      new Response.Listener&lt;String&gt;()
      {
          /** On response **/
          @Override
          public void onResponse(String response) {
              processData(response);
          }
      },
  
      new Response.ErrorListener()
      {
          @Override
          public void onErrorResponse(VolleyError error) {
              // handle error response
          }
  });
  </code></pre>
  
  <p>Is my request queue the problem? I'm making multiple request from different classes to the same static request queue, but that hasn't been a problem until now. </p>
  
  <p>e.g.</p>
  
  <pre><code>MyOtherClass.getRequestQueue();
  //Request code for this class...
  MyOtherClass.RequestQueue.add(myRequest);
  </code></pre>
  
  <p><strong>edit</strong></p>
  
  <p>My urls are working. They expire pretty fast because they are signed, but here is one anyways.</p>
  
  <p><a href="http://webservices.amazon.com/onca/xml?AWSAccessKeyId=AKIAJ6L6R4KOPIYIUXUA&amp;Artist=Bill%20Evans%20Trio&amp;AssociateTag=mytag-20&amp;Operation=ItemSearch&amp;SearchIndex=Music&amp;Timestamp=2015-12-18T06%3A15%3A23Z&amp;Title=Sunday%20At%20the%20Village%20Vanguard&amp;Signature=QG97Kngo6khD7jAD0TUIXmy07SW0fmKTsrKnUsaBvYw%3D" rel="nofollow">http://webservices.amazon.com/onca/xml?AWSAccessKeyId=AKIAJ6L6R4KOPIYIUXUA&amp;Artist=Bill%20Evans%20Trio&amp;AssociateTag=mytag-20&amp;Operation=ItemSearch&amp;SearchIndex=Music&amp;Timestamp=2015-12-18T06%3A15%3A23Z&amp;Title=Sunday%20At%20the%20Village%20Vanguard&amp;Signature=QG97Kngo6khD7jAD0TUIXmy07SW0fmKTsrKnUsaBvYw%3D</a></p>