GoodCloud/django-ajax-uploader — pull request #33 by owenmead (2012-11-14 04:55:55+00:00)
Title: Fixes a bug in IE where the returned AJAX is asked to be downloaded

Setting content type to application/json, even though correct, causes problems in IE:
https://github.com/valums/file-uploader/blob/master/readme.md

text/html produced the best results for me. Was getting an error with the recommended text/plain