<?php
$path = parse_url($_SERVER['REQUEST_URI'], PHP_URL_PATH);

if ($path === '/start') {
    header('Location: /handoff', true, 302);
    echo "redirecting to /handoff\n";
    return;
}

if ($path === '/handoff') {
    header('Location: /final', true, 301);
    echo "redirecting to /final\n";
    return;
}

if ($path === '/loop') {
    header('Location: /loop', true, 302);
    echo "redirect loop\n";
    return;
}

if ($path === '/final') {
    header('Content-Type: application/json');
    echo json_encode([
        'status' => 'ok',
        'path' => $path,
    ], JSON_UNESCAPED_SLASHES) . PHP_EOL;
    return;
}

http_response_code(404);
echo "not found\n";