使用SSL时,域内是否有引用标头？
解决方法:
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.
资料来源：http://en.wikipedia.org/wiki/HTTP_referrer
因此,似乎引用者不在域内,而是在SSL内.
