Re: extra dot in result of choose URL (and it isn't a URL)
Re: extra dot in result of choose URL (and it isn't a URL)
- Subject: Re: extra dot in result of choose URL (and it isn't a URL)
- From: "Mark J. Reed" <email@hidden>
- Date: Mon, 29 Aug 2005 08:09:35 -0400
On 8/28/05, Sander Tekelenburg <email@hidden> wrote:
> At 18:57 -0700 UTC, on 2005/08/28, Matt Neuburg wrote:
>
> [choose URL]
>
> > if I choose e.g. a rendezvous web server it says
> > "http://tangerineScream.local."; which has an extra period on the end (though
> > it does seem to work anyway).
In theory, the trailing period on a domain name is the Domain Name
System equivalent of a leading / in a UNIX pathname: it tells you that
the domain name is absolute. With no trailing period, the domain name
is relative - relative to what depends on the context. However, due
to security concerns, the use of relative domain names is pretty much
verboten these days, and even without a trailing dot any given domain
name will be interpreted as absolute as long as it includes at least
one internal dot. So this is mostly a historical curiosity, unless
you're maintaining a DNS server that uses a text "zone file" database,
in which case the trailing-dot vs. no-trailing-dot is rigidly
enforced, and you really don't want to forget the trailing dot on
those full domain names.
--
Mark J. Reed <email@hidden>
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