title: Why some numbers are added to url of ajax object and how to remove them?
body: <p>I Wanna download file for further use, this is the best way I've found, but when I see the Log that is created by <code>beforeSend</code> Event, the URL has been modified by a queryString like:</p>
  
  <pre><code>http://blabla.com/test.swf?_=1346484617818
  </code></pre>
  
  <p>Numbers are random too.</p>
  
  <p>I wonder why this happens !!!!</p>
  
  <pre><code>var url = 'http://blabla.com/test.swf';
  
  $(document).ready(function () {
             $.ajaxSetup({
               'beforeSend':function () {
                            console.log(this.url);}
             });
  
          $.ajax({
              url:url,
              dataType:"script",
              });
  });
  </code></pre>