AfterMiddleware.php

<?php namespace App\Http\Middleware;

use Closure;

class AfterMiddleware{

	/**
	 * Handle an outgoing request.
	 *
	 * @param  \Illuminate\Http\Request  $request
	 * @param  \Closure  $next
	 * @return mixed
	 */
	public function handle($request, Closure $next)
	{

		$response = $next($request);

		$filters = array(
			//Remove HTML comments except IE conditions
			'/<!--(?!\s*(?:\[if [^\]]+]|<!|>))(?:(?!-->).)*-->/s'	=> '',
			// Remove comments in the form /* */
			'/(?<!\S)\/\/\s*[^\r\n]*/'				=> '',
			// Shorten multiple white spaces
			'/\s{2,}/'						=> '',
			// Collapse new lines
			'/(\r?\n)/'						=> ''
		);

		$response = preg_replace(array_keys($filters), array_values($filters), $response);

		return $response;
	}


}

Kernel.php

<?php namespace App\Http;

use Illuminate\Foundation\Http\Kernel as HttpKernel;

class Kernel extends HttpKernel {

	/**
	 * The application's global HTTP middleware stack.
	 *
	 * @var array
	 */
	protected $middleware = [
		'Illuminate\Foundation\Http\Middleware\CheckForMaintenanceMode',
		'Illuminate\Cookie\Middleware\EncryptCookies',
		'Illuminate\Cookie\Middleware\AddQueuedCookiesToResponse',
		'Illuminate\Session\Middleware\StartSession',
		'Illuminate\View\Middleware\ShareErrorsFromSession',
		'App\Http\Middleware\VerifyCsrfToken',
	];

	/**
	 * The application's route middleware.
	 *
	 * @var array
	 */
	protected $routeMiddleware = [
		'auth' => 'App\Http\Middleware\Authenticate',
		'auth.basic' => 'Illuminate\Auth\Middleware\AuthenticateWithBasicAuth',
		'guest' => 'App\Http\Middleware\RedirectIfAuthenticated',
		'minify' => 'App\Http\Middleware\AfterMiddleware'
	];

}

routes.php

<?php

Route::group(['middleware' => 'minify'], function()
{
	Route::get('/', 'BlogController@index');
	Route::get('about', 'AboutController@index');
	Route::get('projects', 'ProjectsController@index');
});