Re: [squid-users] Caching files from Amazon S3

On Sun, 2008-03-16 at 14:30 +0900, Adrian Chadd wrote:

> > >>Cache-Control: private, must-revalidate, max-age=0
>
> This is a hint that squid is going to have to revalidate the object and
> its almost guaranteed to try a revalidation request (if-none-match, if-modified-since,
> etc.)

It's worse.

private: This response is private to a single user only, and a shared
cache like Squid MUST NOT cache the response.

must-revalidate: Before a stale cached copy of this object is used the
server MUST be contacted to verify that it's still fresh.

max-age=0: This object is immediately stale.

The first applies to shared caches only (i.e. Squid). The second two to
all forms of caches including browser caches.

Date - Last-Modified = 0 seconds, which also hints to caches that the
object should not be cached for long as it's changed right now.

But at least there is no Expires header messing things up further...

Regards
Henrik
Received on Tue Mar 18 2008 - 13:49:21 MDT