On 4 Nov 2018, at 16:27, Henrik K wrote:
Can someone actually register and use a domain with underscore in it?
No.
It is worth noting that the SA "standard" for what is treated as a
domain part of an URI is grounded in how MUAs behave, not in conformance
to to any well-defined specification. I recall a conversation I had
either here or in a bug with Kevin McGrail some years back in which I
argued that "could be a domain name in a URI" was too broad a definition
and lost badly on the fact that most of my examples of "Not A URI" were
in fact turned into clickable links by some horrific MUA.
I support the concept of not treating domain-name-like strings that are
not valid hostnames as if they are URI domain-parts. That would mean
anything with an underscore. It MIGHT be more prudent to exempt
leading-underscore labels, as those can be legal domain names that could
have CNAME or DNAME records mapping them to working hostnames.
--
Bill Cole
b...@scconsult.com or billc...@apache.org
(AKA @grumpybozo and many *@billmail.scconsult.com addresses)
Available For Hire: https://linkedin.com/in/billcole
