RequestToken uses the cmd arguments to locate an openshift oauth server and attempts to authenticate via an OAuth code flow and challenge handling.

MultiHandler manages a series of authentication challenges it is single-use only, and not thread-safe.

NegotiateChallengeHandler manages a challenge negotiation session it is single-host, single-use only, and not thread-safe.

ChallengeHandler handles responses to WWW-Authenticate challenges.

Negotiator defines the minimal interface needed to interact with GSSAPI to perform a negotiate challenge/response.