[yyyk]

<http://example.com./> is a valid URL, see for example:

https://jdebp.uk/FGA/web-fully-qualified-domain-name.html

[MildlySerious]

Tangentially, Youtube had a bug surface last year where adding that extra dot let you avoid all ads. Previous discussion[1]

[1] https://news.ycombinator.com/item?id=23479435

[userbinator]

This "bug", can definitely also be known as a feature ;-)

[dhsysusbsjsi]

Also nearly every paywalled media site