<?php
if (! isset($_GET['value'],$_GET['count'],$_GET['next']) ) { header("HTTP/1.1 403 Forbidden"); exit; }
header('Cache-Control: max-age=120');
header('Content-Type: text/html; charset=utf-8');
$tmp = time();
header('Date: ' . gmdate('D, d M Y H:i:s',$tmp) . ' GMT');
header('Expires: ' . gmdate('D, d M Y H:i:s',$tmp + 120) . ' GMT');
echo "string";//Тут типа большой текст
exit();