title: Ajax.request using ExtJs
body: <p>I'm having difficulty loading JSON content from a file. <code>console.log</code> prints <code>"server-side failure with status code 0"</code>, meaning that the request failed. </p>
  
  <p>My JSON file URL is correct and the file is present at the given address. </p>
  
  <p>Firebug shows the error:</p>
  
  <pre><code>"NetworkError: 405 Not Allowed - http://localhost:8080/4910.json?_dc=1336714070619
  </code></pre>
  
  <p>and the Net tag shows status <code>405 not allowed</code>. </p>
  
  <p>Any ideas on why this is happening?</p>
  
  <pre><code>Ext.Ajax.request({
                     url: 'http://localhost:8080/4910.json',
                     success: function(response, opts) {
                        var obj = Ext.decode(response.responseText);
                        console.log(obj[0].name);
                     },
                     failure: function(response, opts) {
                        console.log('server-side failure with status code ' + response.status);
                     }
                  });
  </code></pre>
  
  <p>Also, what is adding the parameter <code>_dc=1336714070619</code> to the end of the GET request?</p>