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CSP: referrer

Obsolete
This feature is obsolete. Although it may still work in some browsers, its use is discouraged since it could be removed at any time. Try to avoid using it.

The HTTP Content-Security-Policy (CSP) referrer directive used to specify information in the Referer header (with a single r as this was a typo in the orignal spec) for links away from a page. This API is deprecated and removed from browsers.

Use the Referrer-Policy header instead.

Syntax

Content-Security-Policy: referrer <referrer-policy>;

where <referrer-policy> can be one of the following values:

"no-referrer"
The Referer header will be omitted entirely. No referrer information is sent along with requests.
"none-when-downgrade"
This is the user agent's default behavior if no policy is specified. The origin is sent as referrer to a-priori as-much-secure destination (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" / "origin-when-crossorigin"
Send a full URL when performing a same-origin request, but only send the origin of the document for other cases.
"unsafe-url"
Send a full URL (stripped from parameters) when performing a 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.

Examples

Content-Security-Policy: referrer "none";

Specifications

Not part of any specification.

Browser compatibility

Feature Chrome Firefox Edge Internet Explorer Opera Safari
Basic Support (Yes) — 56.0 37.01 (No) (No) (No) (No)
Feature Android Chrome for Android Edge mobile Firefox for Android IE mobile Opera Android iOS Safari
Basic Support (Yes) — 56.0 (Yes) — 56.0 (No) 37.01 (No) (No) (No)

1. Will be removed, see Bugzilla bug 1302449.

See also

© 2005–2017 Mozilla Developer Network and individual contributors.
Licensed under the Creative Commons Attribution-ShareAlike License v2.5 or later.
https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Content-Security-Policy/referrer