<?
header("Content-type: text/xml");
header("Cache-Control: no-store, no-cache, must-revalidate");
header("Cache-Control: post-check=0, pre-check=0", false);

$filename = $_SERVER['DOCUMENT_ROOT'].$_SERVER['REQUEST_URI'];
if(file_exists($filename)) {
    $xml = file_get_contents($filename);
    $xml = str_replace('www.donballon.ru', $_SERVER['HTTP_HOST'], $xml);
    echo $xml;
}