为什么登录后未重定向到首页？

Question

auth()->attempt($credentials, true)在工作，但是它重定向到/login！例如，我在中间件中没有做任何类似的事情。有人知道发生了什么吗？谢谢

LoginController

public function login(Request $request)
{
    $this->validateLogin($request);

    $credentials = $request->only('email', 'password');

    if (auth()->attempt($credentials, true)) {
        // return 'it works';
        return redirect()->to('/');
    }

    return redirect()->back()->withErrors([
        'msg' => trans('labels.others.credentials_not_valid')
    ]);
}

路线

Route::group(['middleware' => 'auth'], function () {
    Route::get('/', ['as' => 'home', 'uses' => 'HomeController@index']);
});