blueimp/jQuery-File-Upload — pull request #1521 by eranation (2012-07-30 02:59:49+00:00)
Title: Added code to prevent caching during the DELETE request (Chrome)

request didn't reach the server,
Chrome ignored the fact it's a DELETE request and since the image was cached returned the cached image bytes instead of deleting it
I tried to do data.cache = false, but for some reason it didn't work as expected... (I guess it works only with GET requests)
the following is the quickest and dirtiest solution I found, but it will happen to anyone using Chrome and caching those images...
One of the most elusive bugs I ever encountered :)