Content Security Policy combined with HTTP to HTTPS redirection can be used by malicious server to verify whether a known site is within a user's browser history.
Content Security Policy combined with HTTP to HTTPS redirection can be used by malicious server to verify whether a known site is within a user's browser history.
https://www.mozilla.org/en-US/security/advisories/mfsa2016-89/#CVE-2016-9071