Re: cache statistics

["Abbie Barbir" <abbieb@nortelnetworks.com>]

----- Original Message -----
From: "Fred Douglis" <douglis@research.att.com>
To: <eric@crystalballinc.com>
Cc: <cdn@ops.ietf.org>
Sent: Tuesday, January 09, 2001 1:47 PM
Subject: Re: cache statistics


> >I took a look at an ISPs forward proxy cache stats from about 300GB of
data an
> >d have found the following:
> >
> ...
> >A breakdown of the non cacheable stats shows:
> ...
> >Cookie in Response: 3.3%
> ...
>
>
> This is a hot button of mine, because I have seen this sort of
> breakdown on numerous occasions.  Am I mistaken, or is a cookie
> in the *request* also *possibly* a reason why data might be
> uncachable in HTTP/1.0, while for 1.1, explicit cache headers
> are to be used and the presence of a cookie is deemed irrelevant?
>

i think because of the cookie in the request.....


> How did your data break down 1.0 v 1.1, and how many requests had
> cookies?  I say that the request is sufficient because a request that
> identifies a user can get a user-specific response even if the
> reply doesn't include a cookie.  However, I know there are many
> cases where caches choose to ignore that fact, and I recall hearing
> that some analysis showed that most content (at least images) will
> be the same regardless of the cookie.
>
> Fred
>
>