The current HttpChannelizer allows for extension through an Authenticator class supplied through the authorization settings. There isn't, however, an extension point for an authentication handler. Currently the choice is between the `AllowAllAuthenticator` or the `HttpBasicAuthenticationHandler`. One would need to create a new channelizer where the HttpChannelizer would suffice. Creating an abstract class that can be extended would make it easier to extend Authentication for things like token authentication schemes.