Laravel认证不持久

Question

在我的laravel 5.4安装中，Auth不会持续存在。我已经阅读了很多其他帖子，所有这些都与修改路由中间件有关，但我没有太多运气。

登录后，我基本上会进入重新直接循环，因为我已经过身份验证，重定向回我的主页，但该主页（通过路由）并不认为我已登录要求我再次登录！

routes（web.php）

Route::group(['middleware' => 'web'], function () {

    // Frontpage
    Route::get('/', ['as' => 'home', function () {
        return redirect('audiolibrary');
    }]);

    // AUTH
    Route::get('login', [
        'as' => 'auth.login', 'uses' => 'AuthController@login',
    ]);
    Route::get('logout', [
        'as' => 'auth.login', 'uses' => 'AuthController@logout',
    ]);

});

Route::group(['middleware' => ['web', 'auth']], function () {

    // AUDIO LIBRARY
    Route::get('audiolibrary', [
        'as' => 'audiolibrary.index', 'uses' => 'AudioLibraryController@index',
    ]);

});

AuthController.php     

namespace App\Http\Controllers;

use Auth;
use App\User;
use Illuminate\Http\Request;
use Illuminate\Auth\Authenticatable;

class AuthController extends Controller
{

    public function login(Request $request)
    {

        $code = $request->get('code');
        $googleService = \OAuth::consumer('Google');

        if (!is_null($code)) {
            $token = $googleService->requestAccessToken($code);

            $google = json_decode($googleService->request('https://www.googleapis.com/oauth2/v1/userinfo'), true);

            if(User::where('email', '=', $google['email'])->first()){
                $user = User::where('email', '=', $google['email'])->first();
                Auth::login($user);
                return redirect('/');
            } else {
                $user = new User();
                $user->name = $google['name'];
                $user->email = $google['email'];
                $user->save();

                Auth::login($user);
            }
        } else {
            $url = $googleService->getAuthorizationUri();           
            return redirect((string)$url);
        }
    }   

}