[11768] in www-talk@info.cern.ch
Re: Conditional GET behavior of common HTTP clients?
daemon@ATHENA.MIT.EDU (Koen Holtman)
Mon Dec 11 18:04:40 2000
Date: Mon, 11 Dec 2000 14:58:02 -0800 (PST)
From: Koen Holtman <koen@hep.caltech.edu>
To: Louis Theran <louis.theran@nokia.com>
Cc: www-talk@w3.org
In-Reply-To: <m3wvd7zjei.fsf@nokia.com>
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I can't answer all of these, but...
On 10 Dec 2000, Louis Theran wrote:
>
> Has anybody done a survey of how common HTTP clients generate
> conditional GET requests? (A quick search didn't turn up anything
> interesting.)
>
> I'm mostly interested in:
>
> * Whether If-None-Match is used at all
I don't know. You might be able to find statistics about the use of this
header on the W3C's web characterisation pages.
>
> * Whether Last-Modified timestamps are really being used as nonces
Most, if not all, modern browsers will only send if-modified-since headers
with exacly the same date as was in the last-modified header of the
response they try to revalidate.
>
> * Whether ``Cache-Control: max-age=...'' is respected
All HTTP/1.1 implementations should, and I believe that by now most of the
browsers and proxy caches out there implement HTTP/1.1.
Koen.
