| Interface | Description | 
|---|---|
| AuthCache | Abstract  AuthSchemecache. | 
| AuthenticationHandler | Deprecated (4.2)  use  AuthenticationStrategy | 
| AuthenticationStrategy | /**
 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. | 
| BackoffManager | Represents a controller that dynamically adjusts the size
 of an available connection pool based on feedback from
 using the connections. | 
| ConnectionBackoffStrategy | When managing a dynamic number of connections for a given route, this
 strategy assesses whether a given request execution outcome should
 result in a backoff signal or not, based on either examining the
  Throwablethat resulted or by examining the resulting
 response (e.g. | 
| CookieStore | This interface represents an abstract store for  Cookieobjects. | 
| CredentialsProvider | Abstract credentials provider that maintains a collection of user
 credentials. | 
| HttpClient | This interface represents only the most basic contract for HTTP request
 execution. | 
| HttpRequestRetryHandler | A handler for determining if an HttpRequest should be retried after a
 recoverable exception during execution. | 
| RedirectHandler | Deprecated (4.1)  use  RedirectStrategy | 
| RedirectStrategy | A strategy for determining if an HTTP request should be redirected to
 a new location in response to an HTTP response received from the target
 server. | 
| RequestDirector | Deprecated (4.3) No longer used | 
| ResponseHandler<T> | Handler that encapsulates the process of generating a response object
 from a  HttpResponse. | 
| ServiceUnavailableRetryStrategy | Strategy interface that allows API users to plug in their own logic to
 control whether or not a retry should automatically be done, how many times
 it should be retried and so on. | 
| UserTokenHandler | A handler for determining if the given execution context is user specific
 or not. | 
| Exception | Description | 
|---|---|
| CircularRedirectException | Signals a circular redirect | 
| ClientProtocolException | Signals an error in the HTTP protocol. | 
| HttpResponseException | Signals a non 2xx HTTP response. | 
| NonRepeatableRequestException | Signals failure to retry the request due to non-repeatable request
 entity. | 
| RedirectException | Signals violation of HTTP specification caused by an invalid redirect | 
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