DESCRIPTION: Authentication ABB is an Application Function contained within the Authentication Middleware that represents the function of the middleware that enables the user to authenticate itself once he has made the request. SOURCE: https://framework.zend.com/blog/2017-04-26-authentication-middleware.html#:~:text=Authentication%20middleware&text=This%20middleware%20checks%20for%20a,redirect%20the%20redirect%20configuration%20value.