[AnIdiotOnTheNet]

Some around here have argued that allowing filenames with spaces was a bad idea. I disagree, but the rationale is not "colonial", it's a matter of practical limitations and whether we should modify our behavior to make the system simpler or try to conform the system to our ludicrously messy standards and, as a consequence, make them more complex and therefor fragile.

The standards do have limitations anyway. For instance, you cannot have an underscore in a hostname on the internet. You can have one in a CNAME, technically, but most CAs will not sign a certificate for any name with an underscore.

[jesprenj]

https://_.4a.si. works for me with letsencypt wildcard cert in firefox (: