php-8.0.30-src/ext/standard/tests/streams/bug64433_srv.inc

if(!empty($_REQUEST["redir"])) {
    echo "REDIRECTED\n";
    return;
}

if(!empty($_REQUEST["loc"])) {
    header("Location: index.php?redir=1");
}

if(!empty($_REQUEST["status"])) {
    http_response_code($_REQUEST["status"]);
}

echo "HELLO!\n";