I was having this problem with a project, and I followed the fix explained in this post:
Add onprogress handler to work on IE9
can you think up a way to add a unit test for this problem?
I can't think anything, @rvagg. For me, the problem happen randomly for the same request with the same response. I will create a VM for more tests.
whoa. bogus. surely the jQuery folks have ran into this. did they add this same stubbed method?