<?php

if ($_SERVER['REDIRECT_URL'] == '/404/') {
    header("HTTP/1.0 404 Not Found");
    echo 'data dir - error 404';
} else if ($_SERVER['REDIRECT_URL'] == '/500/') {
    header("HTTP/1.0 404 Not Found");
    echo 'data dir - error 500';
} else if ($_SERVER['REDIRECT_URL'] != '') {
    header("HTTP/1.0 404 Not Found");
    echo 'data dir - error 404';
} else {
    echo 'data dir';
}