Hi Folks, I've got a domain where the TLD begins with a number, which appears to be causing Apache httpd to throw a 400 error. So for example, if I try to access my Apache host at "foo.9k", it will tell me it was a bad request.
This got me wondering if I was unaware of some RFC that outlines TLD syntax, so I went digging. What I found (and how I understood it), a TLD "must be alphabetic" with the exception of unicode TLDs which have the "xn--" prefix. That's how I read it at least, please correct me if I am wrong. Anyways, the reason I want to raise this question is what I found after. I tested with different versions of Apache and different domains. This is what I found: FQDN: foo.9k 2.2.15 - Pass 2.4.6 - Error 400 2.4.7 - Error 400 FQDN: foo.k9 2.2.15 - Pass 2.4.6 - Pass 2.4.7 - Pass FQDN: k9 2.2.15 - Pass 2.4.6 - Pass 2.4.7 - Pass This was tested with Firefox 55.0.2 64-bit and curl 7.47.0. Generally speaking, it looks as if Apache 2.4 and up does not accept a hostname which has a TLD starting with a number. While there is no real TLD that contains a number, it's a bit arbitrary to say the TLD can have a number but cannot start with one. Anyone have any insights on this situation? (beyond why a silly person uses such a TLD in the first place :-P) Cheers, Jon
