# Package org.apache.hc.client5.http

Client component APIs common to all client transports such as connection route information and resolution as well as common HTTP method definitions and exception classes.

See: Description

- Interface Summary
  Interface | Description
  --- | ---
  AuthenticationStrategy | Strategy to select auth schemes in order of preference based on auth challenges presented by the opposite endpoint (target server or a proxy).
  ConnectionKeepAliveStrategy | Interface for deciding how long a connection can remain idle before being reused.
  DnsResolver | Users may implement this interface to override the normal DNS lookup offered by the OS.
  HttpRequestRetryStrategy | 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 done and so on.
  RouteInfo | Connection route information.
  SchemePortResolver | Strategy for default port resolution for protocol schemes.
  UserTokenHandler | A handler for determining if the given execution context is user specific or not.

- Class Summary
  Class | Description
  --- | ---
  ConnectExceptionSupport | Connect exception support methods.
  ContextBuilder | `HttpClientContext` builder.
  HttpRoute | Connection route definition for HTTP requests.
  RouteTracker | Helps tracking the steps in establishing a route.
  SystemDefaultDnsResolver | DNS resolver that uses the default OS implementation for resolving host names.

- Enum Summary
  Enum | Description
  --- | ---
  RouteInfo.LayerType | The layering type of a route.
  RouteInfo.TunnelType | The tunnelling type of a route.

- Exception Summary
  Exception | Description
  --- | ---
  CircularRedirectException | Signals a circular redirect
  ClientProtocolException | Signals an error in the HTTP protocol.
  ConnectTimeoutException | A timeout while connecting to an HTTP server or waiting for an available connection from a connection manager.
  HttpHostConnectException | A `ConnectException` that specifies the `NamedEndpoint` that was being connected to.
  HttpResponseException | Signals a non 2xx HTTP response.
  RedirectException | Signals violation of HTTP specification caused by an invalid redirect
  UnsupportedSchemeException | Signals failure to establish connection using an unknown protocol scheme.

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

Client component APIs common to all client transports such as connection route information and resolution as well as common HTTP method definitions and exception classes.

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