rocket-dynamic-cache-cookie.php

<?php
/**
 * Plugin Name: Dynamic cache based on cookie
 * Description: Serve a different cache version based on cookie value
 * Author:      WP Rocket team
 * License:     GNU General Public License v3 or later
 * License URI: http://www.gnu.org/licenses/gpl-3.0.html
 */

// Basic security, prevents file from being loaded directly.
defined( 'ABSPATH' ) or die( 'Cheatin&#8217; uh?' );

function wp_rocket_dynamic_cache_country( $cookies ) {
	$cookies[] = 'WOOCS';
	return $cookies;
}
add_filter( 'rocket_cache_dynamic_cookies', 'wp_rocket_dynamic_cache_country' );
function wp_rocket_mandatory_cache_country( $cookies ) {
	$cookies[] = 'WOOCS';
	return $cookies;
}
add_filter( 'rocket_cache_mandatory_cookies', 'wp_rocket_mandatory_cache_country' );