I've successfully developed web service using restler framework. I can see those methods are accessible if I visit the URL.
But if someone know that URL he can access my data, so my question comes here-
How do I add username/password protected web service using restler?
If Restler 3, it's really easy to implement API keys. See: http://restler3.phpfogapp.com/examples/_005_protected_api/readme.html