How to manage auth with ionic framework and Laravel 4.0

I'm using ionic framework to make an app, and laravel 4.0 to the Backend (connection to database). I make a login, but when I try to get data from the laravel, I receive a 401 although I was loged in.

This is my code in Laravel

Route::group(array('before' => 'auth'), function(){
  //friends
  Route::post($apiRoute . 'friend/add', 'ApiController@friendAdd');
  Route::get($apiRoute . 'friends/{user}', 'ApiController@friends');
  Route::get($apiRoute . 'friends/see/{userName}', 'ApiController@friend');

  //Profile
  Route::get($apiRoute . 'account/{user}', 'ApiController@account');
  Route::post($apiRoute . 'account/update/{user}', 'ApiController@accountUpdate');
});

Could you please help me?