Most popular variants of the header value (we only show this when there's just a bunch of variants):

• unsafe-url
• same-origin, same-origin
• strict-origin-when-cross-origin, strict-origin-wh…
• no-referrer-when-downgrade, no-referrer-when-down…
• no-referrer, same-origin, origin, strict-origin, …
• : same-origin
• unsafe-url, no-referrer-when-downgrade
• strict-origin-when-cross-origin, strict-origin-wh…
• same-origin, origin-when-cross-origin
• no-referrer, no-referrer
• : unsafe-url
• Strict-origin
• unsafe-url, unsafe-url
• 'no-referrer'
• strict-origin-when-cross-origin, same-origin
• strict-origin-when-cross-origin, no-referrer-when…
• no-referrer, same-origin
• no-referrer-when-downgrade, no-referrer
• strict-origin-when-cross-origin, unsafe-url
• strict-origin-when-cross-origin, strict-origin
• no-referrer, strict-origin-when-cross-origin
• Strict-origin-when-cross-origin
• same-origin, no-referrer-when-downgrade
• sameorigin
• strict-origin-when-cross-origin
• strict-origin
• origin, no-referrer-when-downgrade
• no-referrer, same-origin, strict-origin-when-cros…
• no-referrer-when-downgrade,strict-origin
• no-referrer-when-downgrade
• origin-when-cross-origin, origin-when-cross-origin
• : strict-origin
• no-referrer-when-downgrade, origin
• no-referrer, unsafe-url
• same-origin, no-referrer
• strict-origin-when-cross-origin;
• no-referrer-when-downgrade, origin-when-cross-ori…
• origin-when-cross-origin, strict-origin-when-cros…
• origin, origin
• SAMEORIGIN
• strict-origin-when-cross-origin, origin
• no-referrer-when-downgrade
• SAME-ORIGIN
• same-origin
• origin
• no-referrer
• strict-origin-when-cross-origin,
• origin-when-cross-origin
• same-origin, strict-origin-when-cross-origin
• same-origin, unsafe-url, origin
• no-referrer, no-referrer-when-downgrade
• origin,strict-origin-when-cross-origin
• no-referrer-when-downgrade, strict-origin-when-cr…
• strict-origin-when-cross-origin, no-referrer

The Referrer-Policy HTTP header governs which referrer information, sent in the Referer header, should be included with requests made.

Reference...