W3C home > Mailing lists > Public > ietf-http-wg-old@w3.org > May to August 1997

Re: cache-busting and charsets again

From: Roy T. Fielding <fielding@kiwi.ICS.UCI.EDU>
Date: Wed, 11 Jun 1997 14:37:29 -0700
To: Koen Holtman <koen@win.tue.nl>
Cc: http-wg@cuckoo.hpl.hp.com
Message-Id: <9706111437.aa17951@paris.ics.uci.edu>
>>In any case, it is rare for agent profiles to differ much behind a
>>shared cache during the lifetime of a cached response.
>
>We would hope so, because this would mean that a HTTP/1.1 Vary would be
>able to save round trips often.  
>
>However, I do not believe that differing profiles are that rare in
>practice.  They are very common behind the shared cache of the cern.ch
>domain I am currently using.  And one would expect even bigger
>diversity behind a country-level cache.

Both of those meet my definition of "rare".  It still doesn't change the
number of cachable responses that might have to be stored by the cache.

>>Using multiple URLs is advantageous because it gives the user agent more
>>information, and thus more control over how it completes the retrieval,
>>and also improves load-sharing and mirroring techniques and reduces the
>>amount of information the client has to send to the server on every
>>request. 
>
>I'm confused.  Are you talking about the long-term advantages of
>multiple URLs here?  I don't see how you would get these advantages
>using the current generation of software.

Yes, long term.

....Roy
Received on Wednesday, 11 June 1997 14:48:07 EDT

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