title: Zend Framework $this->_request->isXmlHttpRequest() IE7/8
body: <p>I seem to have a problem with checking for AJAX requests in my controller when using IE7/8.</p>
  
  <pre><code>if($this-&gt;_request-&gt;isXmlHttpRequest()) {
      $do = 'the dance';
  }
  </code></pre>
  
  <p>But <code>$do</code> never gets filled using Zends <code>isXmlHttpRequest()</code> ....</p>
  
  <p>Can anyone help?</p>
  
  <p>EDIT:
  On the clientside I use jQuery to send the request</p>
  
  <pre><code>$.ajax({
          url: url,
          data: data,
          type: "POST",
          success: fx.planer.callback
      });
  
  ajax($form.attr("action"), $form.serialize());
  </code></pre>
  
  <p>Any clue why jQuery is missing the header?</p>