How can we set the s.referrer in DTM?
For vanity urls, we have the redirect landing our our site with a url parameter of "refd" that has the referring domain in it.
For instance, if our real site is "http://mysite.com" and we have a vanity domain of "http://myfancydomain.com" that redirects to http://mysite.com?redf=myfancydomain.com we need to set the s.referrer to "myfancydomain.com".
Custom code?