Adminhtml get url test, place in Magento root folder and execute it

adminhtml_get_url_test_app.php

<?php
use Magento\Framework\App\Area;

require __DIR__ . '/app/bootstrap.php';

class AdminhtmlGetUrlTestApp extends \Magento\Framework\App\Http implements \Magento\Framework\AppInterface
{
    public function launch()
    {
        $this->_state->setAreaCode(Area::AREA_ADMINHTML);
        $this->_objectManager->configure($this->_configLoader->load(Area::AREA_ADMINHTML));

        $this->_request->setRouteName('catalog');
        $this->_request->setControllerName('product_set');
        $this->_request->setActionName('index');

        $originalParams = [
            'sort' => 'set_name',
            'dir' => 'desc',
            'filter' => 'c2V0X25hbWU9YQ==',
        ];

        foreach ($originalParams as $paramName => $paramValue) {
            $this->_request->setParam($paramName, $paramValue);
        }

        /** @var \Magento\Framework\UrlInterface $urlBuilder */
        $urlBuilder = $this->_objectManager->get(\Magento\Framework\UrlInterface::class);
        if (!isset($params['_current'])) {
            $params['_current'] = true;
        }

        // Expected same result for all of them, variables with symbols that can be url encoded get messed up
        $urls = [];
        $urls[] = $urlBuilder->getUrl('*/*/*', $params);
        $urls[] = $urlBuilder->getUrl('*/*/*', $params);
        $urls[] = $urlBuilder->getUrl('*/*/*', $params);
        $urls[] = $urlBuilder->getUrl('*/*/*', $params);

        $this->_response->setBody(implode(PHP_EOL, $urls));
        //the method must end with this line
        return $this->_response;
    }

    public function catchException(\Magento\Framework\App\Bootstrap $bootstrap, \Exception $exception)
    {
        return false;
    }
}

$bootstrap = \Magento\Framework\App\Bootstrap::create(BP, $_SERVER);

/** @var \Magento\Framework\App\Http $app */
$app = $bootstrap->createApplication('AdminhtmlGetUrlTestApp');
$bootstrap->run($app);