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Re: WGLC #353: Multiple Values in Cache-Control headers

From: Ludin, Stephen <sludin@akamai.com>
Date: Thu, 31 May 2012 19:05:51 -0500
To: Mark Nottingham <mnot@mnot.net>, HTTP Working Group <ietf-http-wg@w3.org>
Message-ID: <CBED5490.394F2%sludin@akamai.com>
I like the 'SHOULD' part, but I am uncomfortable with the MAY.  My crystal
ball sees multiple interpretations and implementation of recovery attempts
in the future.  I would suggest leaving the MAY phrase off as it seems to
only invite trouble.


On 5/31/12 4:58 AM, "Mark Nottingham" <mnot@mnot.net> wrote:

>I think this issue is a re-hash of the discussions around error-handling.
>At most, we might add a note to
>che.html#calculating.freshness.lifetime> like this:
>When there is more than one value present for a given directive (e.g.,
>two Expires headers, multiple Cache-Control: max-age directives), it is
>considered invalid. Caches SHOULD consider responses that have invalid
>freshness information to be stale, but MAY attempt to recover (e.g., by
>using the most conservative value).
>The issue also suggests other places to look, but I'm inclined not to go
>too far down this path.
>Mark Nottingham   http://www.mnot.net/
Received on Friday, 1 June 2012 00:06:32 UTC

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