org.apache.http.auth
Interfaces 
AuthScheme
AuthSchemeFactory
AuthSchemeProvider
ContextAwareAuthScheme
Credentials
Classes 
AUTH
AuthOption
AuthSchemeRegistry
AuthScope
AuthState
BasicUserPrincipal
KerberosCredentials
NTCredentials
NTUserPrincipal
UsernamePasswordCredentials
Enums 
AuthProtocolState
ChallengeState
Exceptions 
AuthenticationException
InvalidCredentialsException
MalformedChallengeException