Send a referrer policy header so referrers are not sent externally from administration screens.

Source Source

File: wp-admin/includes/misc.php

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 ) );

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Version Description
4.9.0 Introduced.

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