Re: [squid-users] Caching problem

n Wed, Oct 17, 2007 at 03:30:03PM +0200, Michael Jurisch wrote:
> Ok, I tried it out but it doesn't have the effect I want. :-( Here
> is what I am doing: I go to www.foo.de/pharma.html (squid is the
> accel for www.foo.de) and the access_log of foo.de shows this:
>
> "GET /pharma.html HTTP/1.0" 200 200
> "GET /bild.jpg HTTP/1.0" 200 10107
> "GET /favicon.ico HTTP/1.0" 404 301
>
> I get the 200 code, which is fine.
>
> (BTW: Why does this request of favicon,ico appear? Is this an
> apache configuration thing?)

No, the browser requests the site's icon. Visit a site which has
one, like http://www.abc.net.au/ and you'll see the icon shown in
the location bar in Firefox. Originally this was retrieved by MSIE
when a user added the page to their favourites (hence, favicon), but
it's been adopted by other browsers and Firefox will request it any
time you visit a site.

> Now, if I hit "F5" in Browser (with and without deleting the
> _browser_ cache) the access log shows this:
>
> "GET /pharma.html HTTP/1.0" 304 -
> "GET /bild.jpg HTTP/1.0" 304 -
>
> I get the 304 code (which is correct), but I don't want to have
> this control request. E.g. I want to say that squid "isn't
> allowed" to look at origin server for 30 min. Squid should
> consider the file(s) as fresh for 30 min and _after_ this period
> it should look after the file on origin server.

This is probably because you're telling Firefox to refresh the page,
which causes it to set an HTTP header that tells the proxy you want
it to check for updated content. (Pragma: no-cache or something
similar?)

See what happens if you load the site normally, then open something
else in your browser, clear its disc and memory caches, and then
open the site normally again. This will cause it to make a regular
request, which squid should serve directly from cache if it
considers its cached object to still be valid.

Depending on your needs, you might want to look into the
refresh_pattern options reload-into-ims and ignore-no-cache.
Received on Wed Oct 17 2007 - 23:21:33 MDT