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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 ) );
}