HTMLScriptElement: referrerPolicy property
The referrerPolicy
property of the
HTMLScriptElement
interface reflects the HTML
referrerpolicy
of the <script>
element and
fetches made by that script, defining which referrer is sent when fetching the resource.
Value
A string; one of the following:
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 (e.g.HTTP→HTTP, HTTPS→HTTPS), but isn't sent to a less secure destination (e.g. 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 referrerhttps://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 (e.g. HTTPS→HTTPS), but don't send it to a less secure destination (e.g. 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 (e.g. HTTPS→HTTPS), and send no header to a less secure destination (e.g. 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.
Note: An empty string value (""
) is both the default
value, and a fallback value if referrerpolicy
is not supported. If
referrerpolicy
is not explicitly specified on the
<script>
element, it will adopt a higher-level referrer policy,
i.e. one set on the whole document or domain. If a higher-level policy is not
available, the empty string is treated as being equivalent to
no-referrer-when-downgrade
.
Examples
js
const scriptElem = document.createElement("script");
scriptElem.src = "/";
scriptElem.referrerPolicy = "unsafe-url";
document.body.appendChild(scriptElem);
Specifications
Specification |
---|
HTML Standard # dom-script-referrerpolicy |
Browser compatibility
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