I see no reason to support such a configuration in principle, but for this particular case, I think the fix will be simple.
Actually, I take that back. There are good reasons to support such a situation, the biggest of which is that Google CDNs are blocked in China:
https://issues.dlang.org/show_bug.cgi?id=14004 https://github.com/D-Programming-Language/dlang.org/pull/847
