[L5] How to correctly disable session for some route group?

I need to disable session for API routes. If i use \Config::set('session.driver', 'array'); for API routes then i can't return any response, but redirects only.

In route.php:

Route::group(['prefix' => 'api/v1', 'namespace' => 'Api', 'middleware' => 'api'], function() {
    // some routes
}

In Kernel.php:

protected $routeMiddleware = [
    // ...
    'api'   => 'App\Http\Middleware\ApiAccess'
    // ...
];

In ApiAccess.php:

class ApiAccess implements Middleware {
    public function handle($request, Closure $next) {
        if (starts_with($request->path(), 'api')) {
            \Config::set('session.driver', 'array');
            if (config('app,api_key') != $request->get('api_key')) {
                return response(null, 404); // This not work: Undefined index: _sf2_meta
                return redirect('/'); // This work
            }
        }

        return $next($request);
    }
}