[squid-users] pages not being cached

[Cindy Cicalese]

>
> > I added the logformat command that you suggested. I needed to modify it
> > slightly, since I'm running squid 3.1 (I changed <a to <A and removed
> > %>eui). An example of what I am seeing in /var/log/squid/access.log is:
>
> The 'eui' change is okay, but to ensure the traffic is flowing through
> the correct routes we do need to compare the IPs so 'a' is needed, not 'A'.
>

I am running squid version 3.1.23, which is what is provided by yum with
Red Hat 6. Per the documentation at
http://www.squid-cache.org/Versions/v3/3.1/cfgman/logformat.html, there is
no <a option in squid version 3.1. Is there an alternative way to get that
information with squid version 3.1.23?

> 1457630282.410    490 172.31.169.175 TCP_MISS/200 4621 GET
> > https://<server>/tw4/index.php/Two
> > - FIRST_UP_PARENT/127.0.0.1 text/html Q-CC: "max-age=0" "max-age=0" Q-P:
> > "-" "-" REP-CC: "s-maxage=18000, must-revalidate, max-age=0" REP-EXP: "-"
> > VARY: "-"
> >
>
> The client here is requiring that the cache not be used to answer this
> request.
>

I had read that "Cache-Control: no-cache" indicates that caching should not
be used to satisfy requests, but that "Cache-Control: max-age=0" only
indicates that *client* caching should not be used. Is this not the case?

> Click in the address bar and press enter. Do that twice and see if the access.log
changes. The first may or may not be a MISS. The second should be a HIT or
REFRESH.

If it is a MISS, it continues to be a miss no matter how many times I click
in the address bar and press enter.

However, I have found that the behavior is browser dependent:

IE - caching works:

1457713900.951      0 <external ip> TCP_MEM_HIT/200 4634 GET https://<server
name>
 "s-maxage=18000, must-revalidate, max-age=0" REP-EXP: "-" VARY: "-"

Firefox - caching works:

1457713889.563      0 <external ip> TCP_IMS_HIT/304 319 GET https://<server
name>/tw4/index.php/Two - NONE/- text/html Q-CC: "-" "-" Q-P: "-" "-"
REP-CC:
"-" REP-EXP: "-" VARY: "-"

Chrome - caching does not work:

1457713978.632    344 <external ip> TCP_MISS/304 316 GET https://<server
name>/tw4/index.php/Two - FIRST_UP_PARENT/127.0.0.1 - Q-CC: "max-age=0"
"max-age=
" VARY: "-"

Is there a reason that server side caching would be browser dependent?

Thanks,

Cindy
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