index.php

<?php

use SilverStripe\Control\HTTPApplication;
use SilverStripe\Control\HTTPRequestBuilder;
use SilverStripe\Core\CoreKernel;

// Find autoload.php
if (file_exists(__DIR__ . '/../vendor/autoload.php')) {
    require __DIR__ . '/../vendor/autoload.php';
} elseif (file_exists(__DIR__ . '/vendor/autoload.php')) {
    require __DIR__ . '/vendor/autoload.php';
} else {
    header('HTTP/1.1 500 Internal Server Error');
    echo "autoload.php not found";
    exit(1);
}

// Build request and detect flush
$request = HTTPRequestBuilder::createFromEnvironment();

// Default application
$kernel = new CoreKernel(BASE_PATH);
$app = new HTTPApplication($kernel);
$response = $app->handle($request);
$response->output();