# Package org.apache.hc.client5.http.impl.classic

Classic HTTP client API implementation that supports HTTP/1.1 transport only.

See: Description

- Class Summary
  Class | Description
  --- | ---
  AbstractBackoff | AbstractBackoff is an abstract class that provides a common implementation for managing backoff behavior in HttpClient connection pool.
  AbstractHttpClientResponseHandler<T> | A generic `HttpClientResponseHandler` 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.
  BackoffStrategyExec | Request execution handler in the classic request execution chain that is responsible for execution of an `ConnectionBackoffStrategy`.
  BasicHttpClientResponseHandler | A `HttpClientResponseHandler` that returns the response body as a String for successful (2xx) responses.
  ClassicRequestCopier | Deprecated Use `ClassicRequestBuilder`
  CloseableHttpClient | Base implementation of `HttpClient` that also implements `ModalCloseable`.
  CloseableHttpResponse | Provided for backward compatibility with HttpClient 4.x.
  ConnectExec | Request execution handler in the classic request execution chain that is responsible for establishing connection to the target origin server as specified by the current connection route.
  ContentCompressionExec | Request execution handler in the classic request execution chain that is responsible for automatic response content decompression.
  DefaultBackoffStrategy | This `ConnectionBackoffStrategy` backs off either for a raw network socket or connection timeout or if the server explicitly sends a 429 (Too Many Requests) or a 503 (Service Unavailable) response.
  ExponentialBackoffManager | A backoff manager implementation that uses an exponential backoff algorithm to adjust the maximum number of connections per HTTP route.
  FutureRequestExecutionMetrics | Collection of different counters used to gather metrics for `FutureRequestExecutionService`.
  FutureRequestExecutionService | This class schedules message execution execution and processing as `FutureTask`s with the provided `ExecutorService`.
  HttpClientBuilder | Builder for `CloseableHttpClient` instances.
  HttpClients | Factory methods for `CloseableHttpClient` instances.
  HttpRequestRetryExec | Request executor in the request execution chain that is responsible for making a decision whether a request that failed due to an I/O exception or received a specific response from the target server should be re-executed.
  LinearBackoffManager | An implementation of `BackoffManager` that uses a linear backoff strategy to adjust the maximum number of connections per route in an `PoolingHttpClientConnectionManager`.
  MainClientExec | Usually the last request execution handler in the classic request execution chain that is responsible for execution of request / response exchanges with the opposite endpoint.
  MinimalHttpClient | Minimal implementation of `CloseableHttpClient`.
  NullBackoffStrategy | This is a `ConnectionBackoffStrategy` that never backs off, for compatibility with existing behavior.
  ProtocolExec | Request execution handler in the classic request execution chain that is responsible for implementation of HTTP specification requirements.
  ProxyClient | ProxyClient can be used to establish a tunnel via an HTTP/1.1 proxy.
  RedirectExec | Request execution handler in the classic request execution chain responsible for handling of request redirects.

- Exception Summary
  Exception | Description
  --- | ---
  RequestAbortedException | Signals that the request has been aborted.
  RequestFailedException | Signals that the request has been aborted or failed due to an expected condition.

## Package org.apache.hc.client5.http.impl.classic Description

Classic HTTP client API implementation that supports HTTP/1.1 transport only. This implementation is mostly API compatible with HttpClient 4.5. Please use the asynchronous client API implementation for HTTP/2 transport.

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