Also: HttpClient
package

org.apache.http.auth

The API for client-side HTTP authentication against a server.

Interfaces

AuthScheme This interface represents an abstract challenge-response oriented authentication scheme. 
AuthSchemeFactory Factory for AuthScheme implementations. 
ContextAwareAuthScheme This interface represents an extended authentication scheme that requires access to HttpContext in order to generate an authorization string. 
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 

Classes

AUTH Constants and static helpers related to the HTTP authentication. 
AuthSchemeRegistry Authentication scheme registry that can be used to obtain the corresponding authentication scheme implementation for a given type of authorization challenge. 
AuthScope The class represents an authentication scope consisting of a host name, a port number, a realm name and an authentication scheme name which Credentials apply to. 
AuthState This class provides detailed information about the state of the authentication process. 
BasicUserPrincipal Basic user principal used for HTTP authentication 
NTCredentials Credentials implementation for Microsoft Windows platforms that includes Windows specific attributes such as name of the domain the user belongs to. 
NTUserPrincipal Microsoft Windows specific user principal implementation. 
UsernamePasswordCredentials Simple Credentials implementation based on a user name / password pair. 

Exceptions

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