Can you at least get the domain of the https referer?

Question

I\'ve noticed that if a foreign https: site links to my non-https site, that I don\'t get anything in the HTTP Referer header at all. I\'ve experienced this with <

Answer 1

You should check this answer : Get referrer URL - visitors coming from Paypal (HTTPS)

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In case your site uses HTTP (not HTTPS) and the referer uses HTTPS, there is no Referrer being sent!

HTTP RFC - 15.1.3 Encoding Sensitive Information in URI's states:

Clients SHOULD NOT include a Referer header field in a (non-secure) HTTP request if the referring page was transferred with a secure protocol.

So the only way to get the Referrer is to use HTTPS on your site.