Force HTTPS with Zend Framework 2.0

<?php

/**
 * Reich Consulting
 *
 * @author    Brian Reich <breich@reich-consulting.net>
 * @copyright (C) 2013 Reich Consulting http://www.reich-consulting.net
 * @version   1.0
 */

namespace ForceHttps
{
    use Zend\ModuleManager\ModuleManager;
    use Zend\Mvc\MvcEvent;

    /**
     * ForceHttps Module for Zend Framework 2.0
     *
     * This is a drop-in module for Zend Framework 2.0 which forces all traffic
     * through HTTPS. In order to use this module you need to copy this code to
     * <project>/module/ForceHttps/Module.php, then add ''ForceHttps' to the
     * modules config in application.config.php.
     *
     * @namespace ForceHttps
     */
    class Module
    {
        /**
         * Adds listener to "route" event from Zend\Mvc\Application which
         * forces communication through https.
         *
         * @param ModuleManager $moduleManager The ModuleManager
         */
        public function init(ModuleManager $moduleManager)
        {
            $moduleManager->getEventManager()->getSharedManager()->attach(
                    'Zend\Mvc\Application', 'route',
                    array($this, 'enforceHttps'), -10
            );

        }

        /**
         * Enforces https.
         *
         * @param MvcEvent $event The event generated from the request.
         *
         * @return \Zend\Http\Response Returns the modified response.
         */
        public function enforceHttps(MvcEvent $event)
        {
            // Get Request object and URI of request
            $request = $event->getRequest();
            $uri     = $request->getUri();

            // If scheme isn't https, change URI and redirect.
            if( $uri->getScheme() !== 'https' )
            {
                $uri->setScheme( 'https' );    // Change scheme to https
                $uri->setPort(null);           // Let server decide https port

                $response = $event->getResponse();
                $response->getHeaders()->addHeaderLine('Location', $uri->__toString() );

                return $response;
            }

        }

    }
}