HTTPS Web site jumps to HTTP Web site, referrer not get the problem

At work, there is an Activity list page A, to link to the specific Activity Details page b,a page on the HTTPS website, b page on the HTTP website, from HTTPS to the HTTP site, for user privacy security information, the browser does not transfer the default referrer

If you want to get referrer properly, you can add <meta content= "always" name= "referrer" on page A

At that time also encountered a problem, with this two slashes to match//to the target page, the protocol generated by the target page is based on the current page (source page) of the protocol that Judge,

For example a page protocol is HTTPS, with this <a href= "//www.demo.com"/> Jump to the target page of the specific URL is https://www.demo.com

If the A-page protocol is HTTP, use this <a href= "//www.demo.com"/> Jump to the target page of the specific URL is http://www.demo.com

HTTPS Web site jumps to HTTP Web site, referrer not get the problem