# Package org.apache.http.impl.client

Default HTTP client implementation.

See: Description

- Class Summary
  Class | Description
  --- | ---
  AbstractAuthenticationHandler | Deprecated (4.2) use `AuthenticationStrategy`
  AbstractHttpClient | Deprecated (4.3) use `HttpClientBuilder`.
  AbstractResponseHandler<T> | A generic `ResponseHandler` that works with the response entity for successful (2xx) responses.
  AIMDBackoffManager | The `AIMDBackoffManager` applies an additive increase, multiplicative decrease (AIMD) to managing a dynamic limit to the number of connections allowed to a given host.
  AutoRetryHttpClient | Deprecated (4.3) use `HttpClientBuilder`.
  BasicAuthCache | Default implementation of `AuthCache`.
  BasicCookieStore | Default implementation of `CookieStore`
  BasicCredentialsProvider | Default implementation of `CredentialsProvider`.
  BasicResponseHandler | A `ResponseHandler` that returns the response body as a String for successful (2xx) responses.
  ClientParamsStack | Deprecated (4.3) use configuration classes provided 'org.apache.http.config' and 'org.apache.http.client.config'
  CloseableHttpClient | Base implementation of `HttpClient` that also implements `Closeable`.
  ContentEncodingHttpClient | Deprecated (4.2) use `HttpClientBuilder`
  CookieSpecRegistries |
  DecompressingHttpClient | Deprecated (4.3) use `HttpClientBuilder`
  DefaultBackoffStrategy | This `ConnectionBackoffStrategy` backs off either for a raw network socket or connection timeout or if the server explicitly sends a 503 (Service Unavailable) response.
  DefaultClientConnectionReuseStrategy |
  DefaultConnectionKeepAliveStrategy | Default implementation of a strategy deciding duration that a connection can remain idle.
  DefaultHttpClient | Deprecated (4.3) use `HttpClientBuilder` see also `CloseableHttpClient`.
  DefaultHttpRequestRetryHandler | The default `HttpRequestRetryHandler` used by request executors.
  DefaultProxyAuthenticationHandler | Deprecated (4.2) use `ProxyAuthenticationStrategy`
  DefaultRedirectHandler | Deprecated (4.1) use `DefaultRedirectStrategy`.
  DefaultRedirectStrategy | Default implementation of `RedirectStrategy`.
  DefaultRequestDirector | Deprecated Do not use.
  DefaultServiceUnavailableRetryStrategy | Default implementation of the `ServiceUnavailableRetryStrategy` interface.
  DefaultTargetAuthenticationHandler | Deprecated (4.2) use `TargetAuthenticationStrategy`
  DefaultUserTokenHandler | Default implementation of `UserTokenHandler`.
  EntityEnclosingRequestWrapper | Deprecated (4.3) do not use.
  FutureRequestExecutionMetrics | Collection of different counters used to gather metrics for `FutureRequestExecutionService`.
  FutureRequestExecutionService | HttpAsyncClientWithFuture wraps calls to execute with a `HttpRequestFutureTask` and schedules them using the provided executor service.
  HttpAuthenticator | Deprecated (4.3) reserved for internal use.
  HttpClientBuilder | Builder for `CloseableHttpClient` instances.
  HttpClients | Factory methods for `CloseableHttpClient` instances.
  HttpRequestFutureTask<V> | FutureTask implementation that wraps a HttpAsyncClientCallable and exposes various task specific metrics.
  IdleConnectionEvictor | This class maintains a background thread to enforce an eviction policy for expired / idle persistent connections kept alive in the connection pool.
  LaxRedirectStrategy | Lax `RedirectStrategy` implementation that automatically redirects all HEAD, GET, POST, and DELETE requests.
  NoopUserTokenHandler | Noop implementation of `UserTokenHandler` that always returns `null`.
  NullBackoffStrategy | This is a `ConnectionBackoffStrategy` that never backs off, for compatibility with existing behavior.
  ProxyAuthenticationStrategy | Default `AuthenticationStrategy` implementation for proxy host authentication.
  ProxyClient | ProxyClient can be used to establish a tunnel via an HTTP proxy.
  RedirectLocations | This class represents a collection of `URI`s used as redirect locations.
  RequestWrapper | Deprecated (4.3) do not use.
  RoutedRequest | Deprecated (4.3) do not use.
  StandardHttpRequestRetryHandler | `HttpRequestRetryHandler` which assumes that all requested HTTP methods which should be idempotent according to RFC-2616 are in fact idempotent and can be retried.
  SystemDefaultCredentialsProvider | Implementation of `CredentialsProvider` backed by standard JRE `Authenticator`.
  SystemDefaultHttpClient | Deprecated (4.3) use `HttpClientBuilder`
  TargetAuthenticationStrategy | Default `AuthenticationStrategy` implementation for proxy host authentication.
  WinHttpClients | Factory methods for `CloseableHttpClient` instances configured to use integrated Windows authentication by default.

- Exception Summary
  Exception | Description
  --- | ---
  TunnelRefusedException | Deprecated (4.3) reserved for internal use.

## Package org.apache.http.impl.client Description

Default HTTP client implementation.

The usual execution flow can be demonstrated by the code snippet below:

     CloseableHttpClient httpclient = HttpClients.createDefault();
     try {
          HttpGet httpGet = new HttpGet("http://targethost/homepage");
          CloseableHttpResponse response = httpclient.execute(httpGet);
          try {
              System.out.println(response.getStatusLine());
              HttpEntity entity = response.getEntity();
              // do something useful with the response body
              // and ensure it is fully consumed
              EntityUtils.consume(entity);
          } finally {
              response.close();
          }
     } finally {
          httpclient.close();
     }

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