Fixes the canonical URL to always be HTTP (SEO)

allow-https.php

<?php
/**
 * Plugin Name: Allow HTTPS
 * Description: Fixes the canonical URL to always be HTTP
 * Version:     1.0
 * Author:      Zachary Scott
 */

namespace zacscott;

/**
 * Allow HTTPS plugin driver class.
 *
 * @author Zachary Scott <[email protected]>
 */
class AllowHttpsPlugin {

	function __construct() {
		add_filter( 'wpseo_canonical', array( $this, 'rewrite_canonical' ), 999999999 );
	}

	// Force canonical URL to be HTTP
	function rewrite_canonical( $permalink ) {

		if ( ! empty( $permalink ) ) {

			return str_replace( 'https://', 'http://', $permalink );

		} else {

			return $permalink;

		}

	}

}

// Boot
new AllowHttpsPlugin();