Return response on route

Module.php

<?php
use Zend\Mvc\MvcEvent;

class Module
{
    public function onBootstrap($e)
    {
        $app = $e->getApplication();
        $sl  = $app->getServiceManager();
        $em  = $app->getEventManager();

        $em->attach(MvcEvent::EVENT_ROUTE, function($e) use ($sl) {
            $connection = $sl->get('My-Database-Connection');
            $result     = $connection->test();

            if (false === $result) {
                $response = $e->getResponse();
                $response->setStatusCode(500);
                $response->setContent('Ooops!');

                return $response;
            }
        });
    }
}