## org.apache.http.client
Interface AuthenticationHandler

All Known Implementing Classes:
  AbstractAuthenticationHandler, DefaultProxyAuthenticationHandler, DefaultTargetAuthenticationHandler

    public interface AuthenticationHandler

/** A handler for determining if an HTTP response represents an authentication challenge that was sent back to the client as a result of authentication failure.

Implementations of this interface must be thread-safe. Access to shared data must be synchronized as methods of this interface may be executed from multiple threads.

Since:
  4.0

Method Summary
`Map<String,Header>` `getChallenges(HttpResponse response, HttpContext context)` Extracts from the given HTTP response a collection of authentication challenges, each of which represents an authentication scheme supported by the authentication host.
`boolean` `isAuthenticationRequested(HttpResponse response, HttpContext context)` Determines if the given HTTP response response represents an authentication challenge that was sent back as a result of authentication failure
`AuthScheme` `selectScheme(Map<String,Header> challenges, HttpResponse response, HttpContext context)` Selects one authentication challenge out of all available and creates and generates `AuthScheme` instance capable of processing that challenge.

Method Detail

### isAuthenticationRequested

    boolean isAuthenticationRequested(HttpResponse response,
                                      HttpContext context)

  Determines if the given HTTP response response represents an authentication challenge that was sent back as a result of authentication failure

  Parameters:
    `response` - HTTP response.
    `context` - HTTP context.
  Returns:
    `true` if user authentication is required, `false` otherwise.

### getChallenges

    Map<String,Header> getChallenges(HttpResponse response,
                                     HttpContext context)
                                     throws MalformedChallengeException

  Extracts from the given HTTP response a collection of authentication challenges, each of which represents an authentication scheme supported by the authentication host.

  Parameters:
    `response` - HTTP response.
    `context` - HTTP context.
  Returns:
    a collection of challenges keyed by names of corresponding authentication schemes.
  Throws:
    `MalformedChallengeException` - if one of the authentication challenges is not valid or malformed.

### selectScheme

    AuthScheme selectScheme(Map<String,Header> challenges,
                            HttpResponse response,
                            HttpContext context)
                            throws AuthenticationException

  Selects one authentication challenge out of all available and creates and generates `AuthScheme` instance capable of processing that challenge.

  Parameters:
    `challenges` - collection of challenges.
    `response` - HTTP response.
    `context` - HTTP context.
  Returns:
    authentication scheme to use for authentication.
  Throws:
    `AuthenticationException` - if an authentication scheme could not be selected.

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