title: Setting headers in XDomainRequest or ActiveXObject('Microsoft.XMLHTTP')
body: <p>I'm trying to do something like this (W3 compliant, DOM):</p>
  
  <pre><code>xhr.setRequestHeader( 'X-Requested-With', 'XMLHttpRequest' );
  </code></pre>
  
  <p>For <code>ActiveXObject('Microsoft.XMLHTTP')</code> and <code>XDomainRequest</code> (IE8). I'm having no such luck finding it anywhere in microsoft documentation or even google. Any idea how I can achieve this?</p>