**UPDATE:** I highly recommend not investing any time in XDomainRequest, because it is a terribly poor implementation with many limitations. It basically only really works for GET requests to non-ssl servers, so you might as well use jsonp or whatever.

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I am using CORS to call a cross domain API, however Internet Explorer is giving issues. CORS should be possible in IE8 and IE9 through the `XDomainRequest` object, however I can&#39;t get things to work..

JQuery [refuses][1] to provide native support for XDomainRequest, however several jQuery plugins are suggested to add this support. This [topic][2] suggest two such plugins: [jQuery.XDomainRequest.js][3] and [xdr.js][4], which has been reported to work. Afaik, the plugins should automatically override behavior of `jQuery.ajax`. I found another plugin [here][5].

I put a little demo pages with the respective plugins [jQuery.XDomainRequest][6] and [xdr][7] and [jquery.ie.cors][8] that perform ajax requests to a CORS enabled server. The pages are working in Chrome and Firefox, however IE8/9 instantly throw a permission denied error (even before making the request). This [MSDN post][9] suggest adding another handler `xhr.onprogress = function() {};` but I tried this and it isn&#39;t working either.

Any clues what I am doing wrong? I have also tested with IE8 now using MS virtual server, but it has exactly the same problem.

Edit: OK so I figured out that part of the problem was that I was using POST over HTTPS. Apparently XDomainRequest does not allow CORS over HTTPS. I can switch to HTTP but I really need POST. 

Edit2: See [this issue on github](https://github.com/MoonScript/jQuery-ajaxTransport-XDomainRequest/issues/1) for the end of this story. It turns out that when using HTTP POST, the xDomainRequest can only encode the request body (arguments) as `text/plain`. This pretty much makes it worthless, because everyone uses `application/x-www-form-urlencoded` or `multipart/form-data`. 


  [1]: http://bugs.jquery.com/ticket/8283
  [2]: https://stackoverflow.com/questions/10232017/ie9-jquery-ajax-with-cors-returns-access-is-denied
  [3]: https://github.com/MoonScript/jQuery-ajaxTransport-XDomainRequest/blob/master/jQuery.XDomainRequest.js
  [4]: https://github.com/tlianza/ajaxHooks/blob/master/src/ajax/xdr.js
  [5]: https://github.com/Ovea/cors/blob/master/src/main/resources/com/ovea/cors/jquery.ie.cors.js
  [6]: http://www.stat.ucla.edu/~jeroen/cors/test1.html
  [7]: http://www.stat.ucla.edu/~jeroen/cors/test2.html
  [8]: http://www.stat.ucla.edu/~jeroen/cors/test3.html
  [9]: http://social.msdn.microsoft.com/Forums/en-US/iewebdevelopment/thread/30ef3add-767c-4436-b8a9-f1ca19b4812e

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CORS with jQuery and XDomainRequest in IE8/9