fix-discovery-links.php

<?php

/*
Plugin Name: Fix oembed_discovery_links output
Description: Modify the oembed discovery links in horrible ways
Version: 1.0
Author: Jan Dembowski
Author URI: https://blog.dembowski.net/
*/

add_filter( 'oembed_discovery_links', 'mh_oembed_add_discovery_links' );

function mh_oembed_add_discovery_links( $output ) {

	$mh_newencoded = urlencode( home_url() . '/?p=' . get_the_ID() );

	$output = '<link rel="alternate" type="application/json+oembed" href="' . esc_url( home_url() . '/?rest_route=%2Foembed%2F1.0%2Fembed&url=' . $mh_newencoded ) . '" />' . "\n";
	if ( class_exists( 'SimpleXMLElement' ) ) {
		$output .= '<link rel="alternate" type="text/xml+oembed" href="' . esc_url( home_url() . '/?rest_route=%2Foembed%2F1.0%2Fembed&url=' . $mh_newencoded ) . '" />' . "\n";
	}

	return $output;
}