php_laravel_laracasts/app/Http/Middleware/RouteCache.php

<?php

namespace App\Http\Middleware;

use Closure;
use Illuminate\Http\Request;
use Illuminate\Support\Facades\Cache;
use Illuminate\Support\Str;

class RouteCache
{
    /**
     * Handle an incoming request.
     *
     * @param  \Illuminate\Http\Request  $request
     * @param  \Closure  $next
     * @return mixed
     */
    public function handle($request, Closure $next)
    {
        $response = Cache::remember($this->makeCacheKey($request), 1, function () use($next, $request) {
           return $next($request);
        });

        return $response;
    }

    protected function makeCacheKey(Request $request) {
        $url = Str::slug($request->url());
        return "route:$url";
    }
}