Security Best Practices

Fixing Referrer-Policy HTTP header

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

Syntax

Note that Referer is actually a misspelling of the word “referrer”. The Referrer-Policyheader does not share this misspelling.

Referrer-Policy: no-referrer
Referrer-Policy: no-referrer-when-downgrade
Referrer-Policy: origin
Referrer-Policy: origin-when-cross-origin
Referrer-Policy: same-origin
Referrer-Policy: strict-origin
Referrer-Policy: strict-origin-when-cross-origin
Referrer-Policy: unsafe-url

Directives

no-referrer
The Referer header will be omitted entirely. No referrer information is sent along with requests.
no-referrer-when-downgrade (default)
This is the user agent’s default behavior if no policy is specified. The URL is sent as a referrer when the protocol security level stays the same (HTTP→HTTP, HTTPS→HTTPS), but isn’t sent to a less secure destination (HTTPS→HTTP).
origin
Only send the origin of the document as the referrer in all cases.
The document https://example.com/page.html will send the referrer https://example.com/.
origin-when-cross-origin
Send a full URL when performing a same-origin request, but only send the origin of the document for other cases.
same-origin
A referrer will be sent for same-site origins, but cross-origin requests will contain no referrer information.
strict-origin
Only send the origin of the document as the referrer when the protocol security level stays the same (HTTPS→HTTPS), but don’t send it to a less secure destination (HTTPS→HTTP).
strict-origin-when-cross-origin
Send a full URL when performing a same-origin request, only send the origin when the protocol security level stays the same (HTTPS→HTTPS), and send no header to a less secure destination (HTTPS→HTTP).
unsafe-url
Send a full URL when performing a same-origin or cross-origin request.

This policy will leak origins and paths from TLS-protected resources to insecure origins. Carefully consider the impact of this setting.

Source

To read more on it, please visit this website.

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