Aborted requests on IE9 are not completed

[montgomery1944]

In one of the applications we had to write a mechanism of aborting previous requests, when the new will be fired, you can see the simplified version here: http://plnkr.co/edit/ntDsVwDgG8digzjxBfKX.

The problem is, that after the change introduced in #9329 abortion of requests on IE9 stopped working, because "onabort" event is not supported there, which means that "completeRequest" function won't be called at all on abort.

In provided plunker you will see alert with message "ABORT" on all supported browsers except IE9.

Please have on mind, that IE9 is behaving weirdly when aborting the request, which was already fixed in Angular in #4940.

[realityking]

Rats. I don't have time to look at it right now as we're having a big release next week, after that I'll try to take a look at it if nobody beats me to it.

A cursory Google search shows that there seem to be quite a few issues with aborting request in IE9 where the request isn't really aborted. However I don't see how #4940 relates to it as we're not accessing the xhr object in the onabort handler.

[pkozlowski-opensource]

@realityking I agree that it doesn't seem to be related to #4940.

Then, when it comes to aborting request on IE - it would be awesome if you could have a look at this one! I'm moving it to 1.3.6 so this issue doesn't get forgotten.