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Re: #282: Recommend minimum sizes for protocol elements

From: Brian Pane <brianp@brianp.net>
Date: Sun, 26 Jun 2011 05:44:21 -0700
Message-ID: <BANLkTi=L0Vo5vFWE9J7V_uSzDdpDoSkX0A@mail.gmail.com>
To: httpbis Group <ietf-http-wg@w3.org>
On Sun, Jun 26, 2011 at 1:19 AM, Poul-Henning Kamp <phk@phk.freebsd.dk> wrote:
> In message <A2439359-80C0-466D-9E1A-7A9316F9FBD0@mnot.net>, Mark Nottingham writes:
>
>>1.4.x Delta Seconds
>>
>>The delta-seconds rule specifies a non-negative integer, representing =
>>time in seconds.
>
> Some high volume sites cache content for only a couple of seconds,
> but derive 20-30% cache hit ratios from it.  For these sites the
> 1 second granularity of age related values are a serious limitation
> on caching policy.
>
> Does anybody know of anything that would break if we allowed real
> numbers for these fields ?
>
> ie:
>        delta-seconds = 1*DIGIT [ '.' *DIGIT]
>

I fear that changing the grammar in HTTP/1.1 would break a lot of
caching intermediaries.  Thinking ahead to future HTTP versions,
though, it seems reasonable to allow fractional seconds.

-Brian
Received on Sunday, 26 June 2011 12:45:08 GMT

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