Implement this interface for any classes that will be called to "start" the authentication process (see method for more details).
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start(Request $request, AuthenticationException $authException = null)
Returns a response that directs the user to authenticate.
This is called when an anonymous request accesses a resource that requires authentication. The job of this method is to return some response that "helps" the user start into the authentication process.
Examples: A) For a form login, you might redirect to the login page return new RedirectResponse('/login'); B) For an API token authentication system, you return a 401 response return new Response('Auth header required', 401);