jonasmonnier/Multipart.as — pull request #1 by normanzb (2013-12-22 14:10:53+00:00)
Title: workaround failed to load when upload is not triggered directly by user interaction

the fix is pulled from here:
https://code.google.com/p/in-spirit/source/detail?r=118&path=/trunk/projects/MultipartURLLoader/ru/inspirit/net/MultipartURLLoader.as