未定义路由- Laravel

Route::get('/example', 'ExampleController@index');

use Symfony\Component\HttpKernel\Exception\NotFoundHttpException;

public function render($request, Exception $exception)
{
    if ($exception instanceof NotFoundHttpException) {
        return response()->view('errors.404', [], 404);
    }

    return parent::render($request, $exception);
}

use Symfony\Component\HttpKernel\Exception\NotFoundHttpException;
use Illuminate\Support\Facades\Redirect;

public function render($request, Exception $exception)
{
    if ($exception instanceof NotFoundHttpException) {
        return Redirect::to('/');
    }

    return parent::render($request, $exception);
}

use Symfony\Component\HttpKernel\Exception\NotFoundHttpException;

public function render($request, Exception $exception)
{
    if ($exception instanceof NotFoundHttpException) {
        return response()->json(['error' => 'Not Found'], 404);
    }

    return parent::render($request, $exception);
}