Re: [squid-users] bypassing cache under certain circumstances

Adrian,

On Mon, Mar 10, 2008 at 5:44 AM, Adrian Chadd <adrian@creative.net.au> wrote:
> Hm, it doens't do this already?

nope, at least not in a way I would expect it to.

> Well, it certainly wouldn't be difficult to. File a bugzilla report;
> see if it tickles the fancy of anyone.

Did it. Will see how it goes. Thanks!

// Aurimas

> On Sat, Mar 08, 2008, Aurimas Mikalauskas wrote:
> > Hello,
> >
> > For the setup I'm about to discuss, I used to use varnish, but due to
> > stability issues decided to use squid instead. It's a rather usual
> > reverse-proxy setup with squid 3.0. However, I do have one issue that
> > could have been solved easily with varnish, but I can't find a good
> > solution for squid. Thing is:
> >
> > Pages are cached. I want them to be cached, but.. there are some users
> > that come with a Cookie NOCACHE. I want those users to get fresh
> > pages, but at the same time, I want that other users would gather the
> > cached pages as usually. I tried the following:
> >
> > acl nocache_cookie req_header Cookie NOCACHE
> > cache deny nocache_cookie
> >
> > However, as described in
> > http://www.squid-cache.org/Versions/v3/3.0/cfgman/cache.html - "use
> > this to force certain objects to never be cached" and not only it does
> > not cache then - but also updates it's cache lists that the object is
> > not cached. So what I get is:
> >
> > #1 user comes w/o NOCACHE -- she gets a CACHE_MISS, page from
> > originserver, and gets it cached
> > #2 user comes w/o NOCACHE -- she gets a CACHE_HIT i.e. the cached page
> > #3 user comes w/ NOCACHE -- she gets a CACHE_MISS and fresh page
> > directly from originserver (page does not get cached)
> > #4 user comes w/o NOCACHE -- she gets a CACHE_MISS, page from
> > originserver, and gets it cached
> >
> > and obviously this is not what I want - I'd rather have page kept in
> > cache at step #3 (at the same time feeding the page directly from
> > originserver to user #3).
> >
> > In varnish I could have achieved that with
> >
> > sub vcl_recv {
> > if (req.http.Cookie ~ "NOCACHE") {
> > pass;
> > }
> > }
> >
> >
> > Appreciate your thoughts!
> >
> > // Aurimas
>
> --
> - Xenion - http://www.xenion.com.au/ - VPS Hosting - Commercial Squid Support -
> - $25/pm entry-level VPSes w/ capped bandwidth charges available in WA -
>
Received on Mon Mar 10 2008 - 05:04:02 MDT