Specification
e.g. Referrer-Policy: no-referrer
Referrer-Policy: no-referrer
no-referrer
no-referrer-when-downgrade
same-origin
origin
strict-origin
origin-when-cross-origin
strict-origin-when-cross-origin
unsafe-url
<meta>
e.g. <meta name="referrer" content="no-referrer"/>
<meta name="referrer" content="no-referrer"/>
e.g. <meta name="referrer" content="never"/>
<meta name="referrer" content="never"/>
never
default
always