Example of Cache Varients on VIP Go

x_cache_seg.php

<?php
/**
 * Example of Cache Varients on VIP Go
 * 
 * @see https://github.com/Automattic/vip-go-mu-plugins/blob/master/cache/examples/segmentation-maintenance-mode-bypass/vip-config.php
 */
function x_cache_seg() {
    
    // Set the response header to let CDN know of possible varient.
    header( 'Vary: X-VIP-Go-Segmentation' );
 
    // Check the inbound request header for vip-go-seg Cookie.
    $segment = $_COOKIE['vip-go-seg'] ?? '';
 
    if ( "humans" === $segment ) {
        echo 'hello humans! 👋';
    } elseif ( "aliens" === $segment ) {
        echo 'hello aliens! 🖖';
    } else {
        echo 'hello world!';
    }
 
    die;
}
x_cache_seg();