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List:       squid-users
Subject:    [squid-users] reverse squid cache configuration
From:       Gromly Romain <gromly () gmail ! com>
Date:       2011-06-30 17:48:28
Message-ID: BANLkTin=JS6kO7Kj3MQwAD=g_K1UH3REVQ () mail ! gmail ! com
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Hello list,

I'm configuring a squid 2.6 (can't upgrade) as reverse proxy and i've
some questions about how cache works.

Here, how my architecture works:

AV Client > GET /file.zip (HTTP/1.1 with Cache-Control: max-age=0 and
sometimes, with also If-Modified-Since: date, it depends of the file)
=> Squid configured with refresh_pattern -i \.zip$ 1440 100% 1440  =>
Apache server with file.zip hosted with a classic configuration

If I try to get the file.zip with IE, it seems to work, I first have a
TCP_MISS/200 and then TCP_HIT/200. No request to the Apache server.

If I try to get the file.zip with the AV Client, I first have a
TCP_MISS/200 but then, I always have a TCP_REFRESH_HIT/200, so Squid
ask to the Apache server if the file is modified, Apache says 304.

I don't want to have this 304 all the time on my Apache but only when
the file is older than 1 day.

I think it could come from the cache-control: max-age=0 and I've tried
all different refresh_pattern configuration, particulary with
override-expires but I still have this TCP_REFRESH_HIT

Also, all my 404 ou 403 are relayed to the Apache, even if I've put
negative_ttl to 15 minutes...

So to resume for all that don't want to read: how not to have
TCP_REFRESH_HIT all the time and how not to relay 404 or 403 error to
the Apache?

If someone have an idea, please, do not hesitate!

Regards,
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