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Re: Fact-checking: do any in-service proxy caches ever ignore Expires?

From: Donald Neal <d.neal@waikato.ac.nz>
Date: Mon, 17 Mar 1997 12:56:40 +1200
Message-Id: <3.0.1.16.19970317125640.096f595c@waikato.ac.nz>
To: http-wg@cuckoo.hpl.hp.com
At 04:15 PM 14/03/97 -0800, Jeffrey Mogul wrote:
>Koen and I have been discussing offline whether it is possible
>to send
>	Expires: Sun, 06 Nov 1994 08:49:37 GMT
>(or some similar ancient date) to ensure that *every* pre-HTTP/1.1
>proxy cache will not, under *any* circumstances, cache the response.

[...]
>Koen mentioned this:
>    Shel Kaphan told me about 1.5 years ago that AOL's proxy cached 1.0
>    responses for some minimum time no matter what.  I don't know if
>    that is still true now.  Also, I think New Zealand's (academic)
>    hierarchical proxy cache system has some kind of nontransparency
>    for `certain sites with a low educational value'.

  Some New Zealand educational caches use very long TTL's for such sites.
That's not the same as ignoring "Expires".

- Donald Neal
Received on Sunday, 16 March 1997 16:02:36 EST

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