Cookies - set on non-cached pages, read on all pages

[David Murphy]

Very helpful, thanks.

So the admin cookies are different from the simple JS cookies that provide the 'Hello <user>' value? 

My understanding is that if a page is cached with unique cookie then there will be an object for every unique cookie value (tom, dick, harry etc) an as a result we'll get a low hit-rate. However, my guess is that I've misunderstood how this works, and that I'm wrong :) 

Is it just the cookie name ('firstname') that is important rather than the cookie value ('Tom') when decided whether to unset the cookie on a varnish cached page?

Thanks, David
________________________________________
From: Richard Chiswell [richard.chiswell at mangahigh.com]
Sent: 20 April 2010 16:13
To: David Murphy
Cc: varnish-misc at varnish-cache.org
Subject: Re: Cookies - set on non-cached pages, read on all pages

Hi David,

On 20/04/2010 16:08, David Murphy wrote:
> Thanks Rich
>
> When you say ignore  do you mean unset e.g.
>
> sub vcl_recv {
>     //snip
>    unset req.http.cookie;
> }
>
We do something like:
sub vcl_recv {
...
if (req.http.Cookie) {
      set req.http.Cookie = ";" req.http.Cookie;
      set req.http.Cookie = regsuball(req.http.Cookie, "; +", ";");
      set req.http.Cookie = regsuball(req.http.Cookie,
";(Cookies|WeWantTo|Keep)=", "; \1=");
      set req.http.Cookie = regsuball(req.http.Cookie, ";[^ ][^;]*", "");
      set req.http.Cookie = regsuball(req.http.Cookie, "^[; ]+|[; ]+$", "");
    if (req.http.Cookie == "") {
         remove req.http.Cookie;
     }
}
...
}

The Cookies|We... regular expression are for things like admin cookies
which we want to be set.

Rich