HttpClient Examples (Async)

• Asynchronous HTTP exchange

  This example demonstrates a basic asynchronous HTTP request / response exchange. Response content is buffered in memory for simplicity.

• Asynchronous HTTP exchange with content streaming

  This example demonstrates an asynchronous HTTP request / response exchange with a full content streaming.

• Pipelined HTTP/1.1 exchanges

  This example demonstrates a pipelined execution of multiple HTTP/1.1 request / response exchanges. Response content is buffered in memory for simplicity.

• Multiplexed HTTP/2 exchanges

  This example demonstrates a multiplexed execution of multiple HTTP/2 request / response exchanges. Response content is buffered in memory for simplicity.

• Request execution interceptors

  This example demonstrates how to insert custom request interceptor and an execution interceptor to the request execution chain.

• Message trailers

  This example demonstrates how to use a custom execution interceptor to add trailers to all outgoing request enclosing an entity..

• Multiplexed HTTP/2 exchanges

  This example demonstrates handling of HTTP/2 message exchanges pushed by the server.

• Client authentication

  This example demonstrates execution of an HTTP request against a target site that requires user authentication.

• Custom SSL context

  This example demonstrates how to create secure connections with a custom SSL context.

• Connection / TLS configuation per route / host

  This example demonstrates how to use connection configuration on a per-route or a per-host basis.

• Connection eviction

  This example demonstrates how to evict expired and idle connections from the connection pool.

• Preemptive BASIC authentication

  This example shows how HttpClient can be customized to authenticate preemptively using BASIC scheme. Generally, preemptive authentication can be considered less secure than a response to an authentication challenge and therefore discouraged.

• HTTP version negotiation

  This example demonstrates how to make HttpClient negotiate or force a particular version of HTTP protocol during the TLS handshake. Please note that protocol version policy setting also applies to non-HTTPS connections.

• Virtual HTTPS / SNI

  This example demonstrates how to use SNI to send requests to a virtual HTTPS endpoint using the async I/O.

• Unix domain sockets

  This example demonstrates how to connect to a local daemon (in this case, the Docker daemon) over a Unix domain socket. Note that this requires Java 17+. On older versions of Java, Unix domain sockets are only supported with classic I/O and require an additional dependency on JUnixSocket.