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HTMLIFrameElement: referrerPolicy property
Baseline
Widely available
*
This feature is well established and works across many devices and browser versions. It’s been available across browsers since September 2020.
* Some parts of this feature may have varying levels of support.
The
HTMLIFrameElement.referrerPolicy
property reflects the HTML referrerpolicy attribute of the
<iframe> element defining which referrer is sent when fetching the
resource.
no-referrer-
The Referer header will be omitted entirely. No referrer
information is sent along with requests.
no-referrer-when-downgrade-
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 (default)-
This is the user agent's default behavior if no policy is specified. 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.
Note:
This policy will leak origins and paths from TLS-protected resources
to insecure origins. Carefully consider the impact of this setting.
js
const iframe = document.createElement("iframe");
iframe.src = "/";
iframe.referrerPolicy = "unsafe-url";
const body = document.querySelector("body");
body.appendChild(iframe); // Fetch the image using the complete URL as the referrer