wp-includes/functions.php:7153Sends a referrer policy header so referrers are not sent externally from administration screens.
One hook fires while wp_admin_headers() runs, in this order:
Filters the admin referrer policy header value.
function wp_admin_headers() { $policy = 'strict-origin-when-cross-origin'; /** * Filters the admin referrer policy header value. * * @since 4.9.0 * @since 4.9.5 The default value was changed to 'strict-origin-when-cross-origin'. * * @link https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Referrer-Policy * * @param string $policy The admin referrer policy header value. Default 'strict-origin-when-cross-origin'. */ $policy = apply_filters( 'admin_referrer_policy', $policy ); header( sprintf( 'Referrer-Policy: %s', $policy ) );}Introduced in 4.9.0. Unchanged from 6.7.7 through 7.1.0.
Signature, return type and hooks compared across 5 parsed releases.
src/wp-includes/functions.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.