Do only follow HTTP and HTTPS redirects

We do not want to follow redirects to other protocols since they might allow an adversary to bypass network restrictions. (i.e. a redirect to ftp:// might be used to access files of a FTP server which might be in a secure zone and not be reachable from the net but from the ownCloud server)
I'm worried about lost of functionality here, some websites might redirect their download links to the real file.
Not sure how often people use this feature though, and also how often such redirect cases might happen.