4 ms·

> They must start with a letter By the RFCs, that's true; but if you think it's true in practice, then 4chan.org would like a word with you.

pwdisswordfish 9y ago
Right... but the no-starting-hyphen rule seems to be more universally accepted. ... ...Oh, fuck me. I just found https://archive.fo/T0WcV https://archive.fo/T0WcV ... (archive.is link because Firefox won't open it directly)
- geofft 9y ago
  I think it's not so much Firefox as your OS - if you're on a GNU platform, glibc will refuse to resolve a hostname that starts with a hyphen (it won't even attempt the resolution), but macOS's libc resolver is totally fine with it. I forget what Windows does.
  - danarmak 9y ago
    Chrome and Firefox on Windows 10 both open http://-emmawatson.tumblr.com/ http://-emmawatson.tumblr.com/ without trouble.
    - Godel_unicode 9y ago
      Doesn't work on chrome for Android, DNS error.
    - Klathmon 9y ago
      My chrome will not open that website (gives a DNS resolution error). Chrome: 61.0.3163.31 (Official Build) beta (64-bit) Windows: Microsoft Windows 10 Pro 10.0.15063 Build 15063 My DNS is pointed at my router which is forwarding requests to Google's 8.8.8.8 DNS servers.
- frandroid 9y ago
  Huh? I just opened it in Firefox Nightly...
- js2 9y ago
  Decade old glibc issue: gethostbyname() cant resolve names starting/ending with "-" https://bugs.launchpad.net/ubuntu/+source/glibc/+bug/144431 https://bugs.launchpad.net/ubuntu/+source/glibc/+bug/144431
  - gazarsgo 9y ago
    I ran across this a couple years ago because Tumblr let you use a leading - for your subdomain... I remember being so shocked reading this thread, but clearly nobody on that discussion had heard of Tumblr at the time. Very surreal.
geofft 9y ago
https://tools.ietf.org/html/rfc1123#page-13 https://tools.ietf.org/html/rfc1123#page-13 The syntax of a legal Internet host name was specified in RFC-952 [DNS:4]. One aspect of host name syntax is hereby changed: the restriction on the first character is relaxed to allow either a letter or a digit. Host software MUST support this more liberal syntax.
- MikeTLive 9y ago
  doesn't say it must not accept anything other than a letter or a digit and so, to cover future leniency changes, i would not be surprised to see poetic-license taken such that they allow damn near anything in an unreliable way.
- bostik 9y ago
  Hmm.. that's from 1989. 3Com would have still been a fairly respected network hardware vendor. I have a strange feeling '3com.com' would have been a consideration when this change was proposed.

pwdisswordfish 9y ago

Right... but the no-starting-hyphen rule seems to be more universally accepted. ... ...Oh, fuck me. I just found https://archive.fo/T0WcV https://archive.fo/T0WcV ... (archive.is link because Firefox won't open it directly)

geofft 9y ago
I think it's not so much Firefox as your OS - if you're on a GNU platform, glibc will refuse to resolve a hostname that starts with a hyphen (it won't even attempt the resolution), but macOS's libc resolver is totally fine with it. I forget what Windows does.
- danarmak 9y ago
  Chrome and Firefox on Windows 10 both open http://-emmawatson.tumblr.com/ http://-emmawatson.tumblr.com/ without trouble.
  - Godel_unicode 9y ago
    Doesn't work on chrome for Android, DNS error.
  - Klathmon 9y ago
    My chrome will not open that website (gives a DNS resolution error). Chrome: 61.0.3163.31 (Official Build) beta (64-bit) Windows: Microsoft Windows 10 Pro 10.0.15063 Build 15063 My DNS is pointed at my router which is forwarding requests to Google's 8.8.8.8 DNS servers.
frandroid 9y ago
Huh? I just opened it in Firefox Nightly...
js2 9y ago
Decade old glibc issue: gethostbyname() cant resolve names starting/ending with "-" https://bugs.launchpad.net/ubuntu/+source/glibc/+bug/144431 https://bugs.launchpad.net/ubuntu/+source/glibc/+bug/144431
- gazarsgo 9y ago
  I ran across this a couple years ago because Tumblr let you use a leading - for your subdomain... I remember being so shocked reading this thread, but clearly nobody on that discussion had heard of Tumblr at the time. Very surreal.

geofft 9y ago

https://tools.ietf.org/html/rfc1123#page-13 https://tools.ietf.org/html/rfc1123#page-13 The syntax of a legal Internet host name was specified in RFC-952 [DNS:4]. One aspect of host name syntax is hereby changed: the restriction on the first character is relaxed to allow either a letter or a digit. Host software MUST support this more liberal syntax.

MikeTLive 9y ago
doesn't say it must not accept anything other than a letter or a digit and so, to cover future leniency changes, i would not be surprised to see poetic-license taken such that they allow damn near anything in an unreliable way.
bostik 9y ago
Hmm.. that's from 1989. 3Com would have still been a fairly respected network hardware vendor. I have a strange feeling '3com.com' would have been a consideration when this change was proposed.