Handling of blob elements in the form data is not really supported by the current curl network backend implementation.
Created attachment 203940 [details] proposed patch With this patch the blob data is resolved and can now be handled by the existing code paths.
Comment on attachment 203940 [details] proposed patch Clearing flags on attachment: 203940 Committed r151346: <http://trac.webkit.org/changeset/151346>
All reviewed patches have been landed. Closing bug.