<?php
/**
 * Plugin Name: HTTP Auth for prebuild
 */

add_filter('swift3_cache_hit_function', function(){
            $user = ''; // HTTP Auth Username
            $password = '' // HTTP Auth password
            return wp_remote_post($url, array(
                  'timeout'   => 30,
                  'sslverify' => false,
                  'user-agent' => Swift3_Helper::ua_string('cache-hit'),
                  'headers' => array('X-PREBUILD' => 1, 'Authorization' => 'Basic ' . base64_encode( $user . ':' . $password)
            ));
});