Stripping out select querystring attribute/value pairs so varnish will not vary cache by them

Question

My goal is to \"whitelist\" certain querystring attributes and their values so varnish will not vary cache between the urls.

Example:

Url 1: http:/         


        

Answer 1

A copy of runamok but i got + instead of %20 in my params so i have added that to my regex

sub vcl_recv {
    # strip out certain querystring params that varnish should not vary cache by
    call normalize_req_url;
    # snip a bunch of other code
}
sub normalize_req_url {
    # Strip out Google Analytics campaign variables.
    # I allso stribe facebook local that are use for facebook javascript.
    # They are only neededby the javascript running on the page
    # utm_source, utm_medium, utm_campaign, gclid, ...
    if(req.url ~ "(\?|&)(gclid|cx|ie|cof|siteurl|zanpid|origin|utm_[a-z]+|fb_local|mr:[A-z]+)=") {
        set req.url = regsuball(req.url, "(gclid|cx|ie|cof|siteurl|zanpid|origin|utm_[a-z]+|fb_local|mr:[A-z]+)=[%.+-_A-z0-9]+&?", "");
    }
    set req.url = regsub(req.url, "(\?&?)$", "");
}