HTML HTTPS和HTTP请求间不会传递referrer
阅读(5784)在一个HTTPS页面，如果有到HTTP页面的请求，是不会带上referer信息的。
反之，HTTP页面发送的HTTPS请求，也不会带有referer信息。
如果都是HTTPS协议，则会正常带有。
浏览器遵循的是HTTP1.1 的 RTC规范 ：
Clients SHOULD NOT include a Referer header field in a (non-secure) HTTP request if the referring page was transferred with a secure protocol.
via: http://smerity.com/articles/2013/where_did_all_the_http_referrers_go.html
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