[dns-operations] charter, sitefinder, opendns (slashdot today)

Paul Vixie paul at vix.com
Thu Feb 15 23:42:19 UTC 2007

> >     GET http://x.gtld-servers.net/ HTTP/1.0
> >
> >     <QUERY NAME="example.com" CLASS="IN" TYPE="A"></QUERY>
> This form would defeat http-caching, which might, or might
> not, be a bad thing depending on your point of view.

ok so wait just a minute there, buddy.  in RFC 2756 which we (vixie, wessels)
wrote, to be found at http://www.htcp.org/ which you (wessels) are hosting,
we spake thusly:

   1.3.  This document specifies a Hyper Text Caching Protocol (HTCP)
   which permits full request and response headers to be used in cache
   management, ...


   4.  Cache Headers

   HTCP/0.0 CACHE-HDRS consist of zero or more of the following headers:

   Cache-Vary: <header-name> ...
      The sender of this header has learned that content varies on a set
      of headers different from the set given in the object's Vary:
      header.  Cache-Vary:, if present, overrides the object's Vary:


now i'll grant you, HTCP use hasn't exactly blossomed.  but i believe that
any web caching agent who indexes its content only by URI is *broken*, since
many web pages will have the same URI but content that differs according to
things like "what human language did the browser prefer to receive?"

More information about the dns-operations mailing list