Github user svenmeier commented on the issue:
https://github.com/apache/wicket/pull/255
Many thanks!
It seems you had to jump through a lot of hoops to make this work with
Wicket's Ajax code -
maybe we can change it to make this easier.
Why not drop the (old) iframe workaround and always use FormData for
multipart requests?
I'll give it a try this afternoon.---
