(27-08-2020, 05:24 AM)z3bra Wrote: URL and IP addresses are not the same thing !

That's not really the issue, we all know that these are different thing. Within the URL standard, IPv4 addresses are only allowed to be formatted a certain way, but relying on inet_aton to parse them allows all possible ways to format them, which can lead to the misinterpretation that these formats are also accepted everywhere, while they probably aren't as this is OS specific.

(27-08-2020, 05:24 AM)z3bra Wrote: They might not be in the spec, but at this point I think that the spec might be too rigid and doesn't accept these format as they go against readability (which is what an URL is about).

I agree, but standards are there for good practices, so it's probably better to not rely on these other forms in URLs.