CakePHP 2 with normal Form Authentication + Basic for API access

I simply can't wrap my head around how this is supposed to work.

I'm trying to create two separate logins. One for admin which is a normal 'Form' authentication with all rights to alter/delete data, and one 'Basic' authentication for model 'Account' which will have some allowed methods. No matter what I do, I allways get a 302 response with redirect to /users/admin/login, and never a Basic Authentication dialog. 

Is it really not possible to do this with the Auth Component?

Response from curl (tried a random url which should require authentication):

$curl -H "Accept:Application/json" http://localhost:8888/myproject/admin/users/index.json -v 

< HTTP/1.1 302 Found

< Date: Wed, 31 Oct 2012 12:38:55 GMT

< Server: Apache

< X-Powered-By: PHP/5.3.6

< Set-Cookie: CAKEPHP=a621801575312e3b56d2c670d314547d; expires=Wed, 31-Oct-2012 16:38:55 GMT; path=/; HttpOnly

< Location: http://localhost:8888/myproject/admin/users/login

< Content-Length: 0

< Content-Type: application/json

< 

* Connection #0 to host localhost left intact

* Closing connection #0

My AppController so far:

<?php

App::uses('Controller', 'Controller');

class AppController extends Controller

{

    public $components = array(

        'Session',

        'RequestHandler',

        'Auth',

    );

    public function beforeFilter()

    {

        parent::beforeFilter();

        if ($this->params['ext'] == 'json') {

            $this->Auth->authenticate = array(

                'Basic' => array(

                    'userModel' => 'Account',

                    'fields' => array('username' => 'facebook_id', 'password' => 'facebook_token'),

                ),

            );

        } else {

            $this->Auth->authenticate = array('Form');

        }

    }

    public function isAuthorized($user)

    {

        return true;

    }

}

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