Package org.apache.hc.client5.http.impl.sync

Default HTTP client implementation.

See: Description

Interface Summary

Interface	Description
ClientExecChain	This interface represents an element in the HTTP request execution chain.

Class Summary

Class	Description
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.
BackoffStrategyExec
BasicCredentialsProvider	Default implementation of CredentialsStore.
CloseableHttpClient	Base implementation of HttpClient that also implements Closeable.
CookieSpecRegistries
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.
DefaultHttpRequestRetryHandler	The default HttpRequestRetryHandler used by request executors.
DefaultServiceUnavailableRetryStrategy	Default implementation of the ServiceUnavailableRetryStrategy interface.
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.
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.
MainClientExec	The last request executor in the HTTP request execution chain that is responsible for execution of request / response exchanges with the opposite endpoint.
MinimalClientExec	Request executor that implements the most fundamental aspects of the HTTP specification and the most straight-forward request / response exchange with the target server.
NoopUserTokenHandler	Noop implementation of UserTokenHandler that always returns null.
NullBackoffStrategy	This is a ConnectionBackoffStrategy that never backs off, for compatibility with existing behavior.
ProtocolExec	Request executor in the request execution chain that is responsible for implementation of HTTP specification requirements.
ProxyClient	ProxyClient can be used to establish a tunnel via an HTTP proxy.
RedirectExec	Request executor in the request execution chain that is responsible for handling of request redirects.
RetryExec	Request executor in the request execution chain that is responsible for making a decision whether a request failed due to an I/O error should be re-executed.
ServiceUnavailableRetryExec	Request executor in the request execution chain that is responsible for making a decision whether a request that received a non-2xx response from the target server should be re-executed.

Exception Summary

Exception	Description
RequestAbortedException	Signals that the request has been aborted.
TunnelRefusedException	Signals that the tunnel request was rejected by the proxy host.

Package org.apache.hc.client5.http.impl.sync 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();
 }