Does GoogleAnalytics supports utm_referrer tag?
My problem is the following. When a user comes to my site (foo.com) from Google, from example, header Referer contains google.com. But my site uses a Captha. In this case a user gets a redirect to my site and Referer google.com is lost. Referer contains foo.com (Captha is on my servers). I'd like somehow to store original referrer. Some metrics use utm_referrer tag in such cases, i.e. store original value of Referer in url, foo.com/?utm_referrer=google.com