# Package org.apache.hc.client5.http.auth

Client HTTP authentication APIs.

See: Description

Interface Summary
AuthCache: This interface represents an cache of `AuthScheme` state information that can be re-used for preemptive authentication by subsequent requests.
AuthScheme: This interface represents an abstract challenge-response oriented authentication scheme.
AuthSchemeFactory: Factory for `AuthScheme` implementations.
Credentials: This interface represents a set of credentials consisting of a security principal and a secret (password) that can be used to establish user identity
CredentialsProvider: Provider of authentication credentials.
CredentialsStore: Abstract store of authentication credentials.

Class Summary
AuthChallenge: This class represents an authentication challenge consisting of a auth scheme and either a single parameter or a list of name / value pairs.
AuthExchange: This class represents the actual state of authentication handshake including the current `AuthScheme` used for request authorization as well as a collection of backup authentication options if available.
AuthScope: `AuthScope` represents an authentication scope consisting of an application protocol, a host name, a port number, a realm name and an authentication scheme name.
BasicUserPrincipal: Basic username based principal representation.
KerberosConfig: Immutable class encapsulating Kerberos configuration options.
KerberosConfig.Builder
KerberosCredentials: Kerberos specific `Credentials` representation based on `GSSCredential`.
NTCredentials: Microsoft Windows specific `Credentials` representation that includes Windows specific attributes such as name of the domain the user belongs to.
NTUserPrincipal: Microsoft Windows specific user principal implementation.
StandardAuthScheme: Authentication schemes by their names supported by the HttpClient.
UsernamePasswordCredentials: Simple `Credentials` representation based on a user name / password pair.

Enum Summary
AuthExchange.State
ChallengeType: Challenge type (TARGET or PROXY)
KerberosConfig.Option

Exception Summary
AuthenticationException: Signals a failure in authentication process
InvalidCredentialsException: Authentication credentials required to respond to a authentication challenge are invalid
MalformedChallengeException: Signals that authentication challenge is in some way invalid or illegal in the given context

Annotation Types Summary
AuthStateCacheable: Indicates that the state of an `AuthScheme` can be cached and re-used for preemptive authentication by subsequent requests.

## Package org.apache.hc.client5.http.auth Description

Client HTTP authentication APIs.