All classes that implement AuthenticationProviderChallengeInterface in Drupal 8
- class \Drupal\Core\Authentication\AuthenticationManager implements AuthenticationProviderChallengeInterface, AuthenticationProviderFilterInterface, AuthenticationProviderInterface
- class \Drupal\basic_auth\Authentication\Provider\BasicAuth implements AuthenticationProviderChallengeInterface, AuthenticationProviderInterface uses DeprecatedServicePropertyTrait