juriga/jQuery-File-Upload — comment on commit 0c9cb2e81186f57cdba884fb1f6920e281e93aa3
File:  line 0
By blueimp:

I'm sorry but I could not reproduce this issue.
In my tests, the jqXHR object returned by data.submit() does contain the abort() method and allows cancelling the request.
I've also double checked with Chrome 17.0.928.0 dev-m on Windows XP.

Can you reproduce the issue on the demo page?
Please try cancelling the upload and check the network tab if the request has been aborted.

If you have a local PHP installation, please also run the tests from the download package - they include several calls of the abort() method on the object returned by data.submit().