BUG: loading from urls is (very likely) broken

[neutrinoceros]

Bug report

Bug summary
This came up when I opened #3772, I'll just edit the relevant bits from there:

So, supposedly, yt.load supports loading from a url, as the following line suggests

yt/yt/loaders.py

Line 93 in 636057b

if not fn.startswith("http"):

However, I don't know of a frontend where it's actually exercised.
Moreover I think the patch #3525 actually breaks this functionality (which didn't pop up in tests), but hasn't landed in a release yet.

Is there anywhere in code base that we actually implement loading anything from urls ? if so, then there's a bug to patch for yt 4.1, otherwise we could just simplify yt.load.

[matthewturk]

It should be; the SDF frontend utilized it. While it may not work now, I do not want to deliberately remove it any further.

[neutrinoceros]

Sure ! then it's a bug to fix