title: What does XMLHttpRequest status code -1 mean?
body: <p>I've added logging of failed AJAX requests to my application and I'm seeing a lot of failures with a status code of <code>-1</code>.</p>
  
  <p>I can't find a definition of the -1 status code anywhere.</p>
  
  <p>Does anyone know what this represents?</p>
  
  <p>I'm seeing it from IE 8.0, Firefox 13, Chrome 20, and more. It doesn't appear to be a browser specific quirk.</p>