Laravelの常時SSL化

<?php

namespace App\Http\Middleware;

use Closure;

class ProtocolSecure {

    public function handle($request, Closure $next) {
        if (!$request->secure()&&env('APP_ENV') === 'production') {
            return redirect()->secure($request->getRequestUri(), 301);
        }

        return $next($request);
    }

}

class Kernel extends HttpKernel
{
    protected $middleware = [

        ...

        \App\Http\Middleware\ProtocolSecure::class,
    ];