Re: I-D Action: draft-ietf-httpbis-cache-08.txt

Amos Jeffries <squid3@treenet.co.nz> Sun, 14 June 2020 02:13 UTC

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From: Amos Jeffries <squid3@treenet.co.nz>
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Date: Sun, 14 Jun 2020 13:27:53 +1200
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Subject: Re: I-D Action: draft-ietf-httpbis-cache-08.txt
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On 14/06/20 1:32 am, Ken Murchison wrote:
> All,
> 
> I'm trying to verify my understanding of must-revalidate vs unqualified
> no-cache in responses per the text in Sections 5.2.2.1 and 5.2.2.3
> respectively.  Other than the point regarding the Authorization header
> field and must-revalidate, is the difference that unqualified no-cache
> requires validation for every request and must-revalidate only requires
> validation after the response has become stale?
> 

The specification difference is exactly that yes.

In practice implementations (particularly older RFC2616 based ones) may
treat "no-cache" as if it were "no-store" and "must-revalidate" as if it
were unqualified "no-cache".

Amos