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- From: Eric Bohlman <ebohlman@netcom.com>
- To: Richard Tobin <richard@cogsci.ed.ac.uk>
- Date: Thu, 24 Jun 1999 11:32:29 -0700 (PDT)
On Thu, 24 Jun 1999, Richard Tobin wrote:
> > That *is* supposed to be a rule: that you can GET the same URL
> > as many times as you want with no changes. Otherwise caching
> > would not work.
>
> Surely the whole mechanism of HTTP "if-modified-since" and "expires"
> headers exists because this is not true?
"With no changes" means "with no changes occurring as a *result* of
GETting the URL. i.e. given a sequence of N>=1 GETs G1,...,Gn to the same
URL with Gn taking place at time Tf, the result of Gn depends only on Tf
and *not* on N.
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