https://bugzilla.wikimedia.org/show_bug.cgi?id=14919#c5
The link above requests upload by url for internal WMF usage.
As part of this, it'd make sense to have a limitation in place, so we can allow grabbing from specified url.
That way it gives a sane error message that you can't get it from elrandomsite.com, rather than it timed out getting it from said site (as in the WMF setup, it won't be able to do the request)
Version: unspecified
Severity: enhancement