core-bundle/src/Routing/UrlGenerator.php
public function generate($name, $parameters = [], $referenceType = self::ABSOLUTE_PATH): ?string
    {
        $this->framework->initialize();

        if (!\is_array($parameters)) {
            $parameters = [];
        }

        $context = $this->getContext();

        // Store the original request context
        $host = $context->getHost();
        $scheme = $context->getScheme();
        $httpPort = $context->getHttpPort();
        $httpsPort = $context->getHttpsPort();

        $this->prepareLocale($parameters);
        $this->prepareAlias($name, $parameters);
        $this->prepareDomain($context, $parameters, $referenceType);

        unset($parameters['auto_item']);

        $url = $this->router->generate(
            'index' === $name ? 'contao_index' : 'contao_frontend',
            $parameters,
            $referenceType
        );

        // Reset the request context
        $context->setHost($host);
        $context->setScheme($scheme);
        $context->setHttpPort($httpPort);
        $context->setHttpsPort($httpsPort);

        return $url;
    }
public function generate($name, $parameters = [], $referenceType = self::ABSOLUTE_PATH): ?string
    {
        $this->framework->initialize();

        if (!\is_array($parameters)) {
            $parameters = [];
        }

        $context = $this->getContext();

        // Store the original request context
        $host = $context->getHost();
        $scheme = $context->getScheme();
        $httpPort = $context->getHttpPort();
        $httpsPort = $context->getHttpsPort();

        $this->prepareLocale($parameters);
        $this->prepareAlias($name, $parameters);
        $this->prepareDomain($context, $parameters, $referenceType);

        unset($parameters['auto_item']);

        $url = $this->router->generate(
            'index' === $name ? 'contao_index' : 'contao_frontend',
            $parameters,
            $referenceType
        );

        // Reset the request context
        $context->setHost($host);
        $context->setScheme($scheme);
        $context->setHttpPort($httpPort);
        $context->setHttpsPort($httpsPort);

        return $url;
    }
{@inheritdoc}