Is there referrer header within domain while using SSL?
If a website is accessed from a HTTP Secure (HTTPS) connection and a link points to anywhere except another secure location, then the referrer field is not sent.
The upcoming standard HTML5 will support the attribute/value rel = "noreferrer" in order to instruct the user agent not to send a referrer.
Source: http://en.wikipedia.org/wiki/HTTP_referrer
So it seems referrer is not within the domain, but within SSL.