<?
    $writeme = 'Headers:'.PHP_EOL;

    foreach (getallheaders() as $name => $value)
        $writeme .= $name.': '.$value;

    $f = fopen("recieved.txt", "a") or die();
    flock($f, LOCK_EX);
    fputs($f, $writeme);
    flock($f, LOCK_UN);
    fclose($f);
    echo 'Hi!';
?>