Referrer-Policy
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https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Referrer-Policy

* Referrer-Policy: strict-origin-when-cross-origin (default)

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From document 	                Navigation to 	                Referrer used
========================        =============================   ========================
https://example.com/page 	https://example.com/otherpage 	https://example.com/page
https://example.com/page 	https://mozilla.org 	        https://example.com/
https://example.com/page 	http://example.com 	        (no referrer)
========================        =============================   ========================

* Referrer-Policy: same-origin

========================        =============================   ========================
From document 	                Navigation to 	                Referrer used
========================        =============================   ========================
https://example.com/page 	https://example.com/otherpage 	https://example.com/page
https://example.com/page 	https://mozilla.org 	        (no referrer)
========================        =============================   ========================

* Referrer-Policy: no-referrer

========================        =============================   ========================
From document 	                Navigation to 	                Referrer used
========================        =============================   ========================
https://example.com/page 	anywhere 	                (no referrer)
========================        =============================   ========================