# Package org.apache.http.client

Client HTTP communication APIs.

See: Description

Interface Summary
Interface | Description
--- | ---
AuthCache | Abstract `AuthScheme` cache.
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 `Throwable` that resulted or by examining the resulting response (e.g.
CookieStore | This interface represents an abstract store for `Cookie` objects.
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 Summary
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

## Package org.apache.http.client Description

Client HTTP communication APIs.