DESCRIPTION: Authentication Middleware ABB is an Application Component that reers to the middleware which checks for a valid identity of AuthenticationService . If no identity is present, it redirects the redirect configuration value. 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.