wp_shortlink_header() WP 3.0.0

Sends a Link: rel=shortlink header if a shortlink is defined for the current page.

Attached to the 'wp' action.

No Hooks.

Return

Nothing (null).

Usage

wp_shortlink_header();

Code of wp shortlink header: wp-includes/link-template.php ^{VER 5.0.3}

<?php
function wp_shortlink_header() {
	if ( headers_sent() )
		return;

	$shortlink = wp_get_shortlink(0, 'query');

	if ( empty($shortlink) )
		return;

	header('Link: <' . $shortlink . '>; rel=shortlink', false);
}