I\'ve developed a REST api for my Symfony2 application. This api will be used by a mobile app. Much of the functionality is done in the context of the currently authenticate
Yes Marc, jules is pointing to an example just to show you how to test authentication with http_basic.
To be RESTful you should avoid using cookies, otherwise just call it an API. About how secure is your authentication system you can go with http_digest over https or more secure signed request with api_key/api_secret approach.
Have a look here http://wiki.zanox.com/en/RESTful_API_authentication