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Re: Question regarding domain name in a web URL

2008-08-28 02:06:13
<darshan(_dot_)karandikar(_at_)tcs(_dot_)com> wrote:
 
Is "www.my.domain.again.my.domain.com" a valid URL on INTERNET?

It's a valid relative URL, but I think that's not what you want
to know...   

I know that "http://my.domain.again.my.domain.com"; can be a
valid INTERNET DNS address

...the other way around it makes sense:  Your first string is a
syntactically valid DNS domain name, and your second string is
a valid HTTP URL for this domain.  Just in case you could add a
trailing dot to your first string, and a trailing slash to your
second string.  For technical details about URIs please look in
<http://tools.ietf.org/html/rfc3986>.

If you have questions about RFC 3986 better ask them on the URI
list uri(_at_)w3c(_dot_)org, see <http://dir.gmane.org/gmane.org.w3c.uri>.

Does "www" has any significance in this URL when it comes to
DNS name resolution?

Yes, the strings without www are different, you could end up at
a different host.  Or in the case of the URL you could get a
different homepage or an error.  Often Web servers arrange that
you get the same content, but that is not required.  Check out
RFC 4367 for some details.

 Frank
--  
Please don't post on IETF lists with private disclaimers, see
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