disable-litespeed-cache-comment.php

<?php
/**
 * Disable LiteSpeed Cache Comment plugin bootstrap.
 *
 * @package   Disable_LiteSpeed_Cache_Comment
 * @author    Weston Ruter, Google
 * @license   GPL-2.0-or-later
 * @copyright 2020 Google Inc.
 *
 * @wordpress-plugin
 * Plugin Name: Disable LiteSpeed Cache Comment
 * Plugin URI:  https://gist.github.com/westonruter/e588bd4ed1778799b19417c838eb5e5e
 * Description: This is needed on sites using the AMP plugin because LiteSpeed Cache by default injects an HTML comment at the end of JSON responses which breaks AMP validation requests.
 * Version:     0.2
 * Author:      Weston Ruter, Google
 * Author URI:  https://weston.ruter.net/
 * License:     GNU General Public License v2 (or later)
 * License URI: http://www.gnu.org/licenses/gpl-2.0.html
 */

add_filter( 'litespeed_comment', '__return_false' );
if ( ! defined( 'LSCACHE_ESI_SILENCE' ) ) {
	define( 'LSCACHE_ESI_SILENCE', true );
}

Note that this plugin should no longer be necessary once 1.6 is released, as the plugin will proactively strip such comments as of ampproject/amp-wp#4679.