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java.net.http (Java SE 11 & JDK 11 )

Provides high-level client interfaces to HTTP (versions 1.1 and 2) and low-level client interfaces to WebSocket. The main types defined are:

• HttpClient
• HttpRequest
• HttpResponse
• WebSocket

The protocol-specific requirements are defined in the Hypertext Transfer Protocol Version 2 (HTTP/2), the Hypertext Transfer Protocol (HTTP/1.1), and The WebSocket Protocol.

In general, asynchronous tasks execute in either the thread invoking the operation, e.g. sending an HTTP request, or by the threads supplied by the client's executor. Dependent tasks, those that are triggered by returned CompletionStages or CompletableFutures, that do not explicitly specify an executor, execute in the same default executor as that of CompletableFuture, or the invoking thread if the operation completes before the dependent task is registered.

CompletableFutures returned by this API will throw UnsupportedOperationException for their obtrudeValue and obtrudeException methods. Invoking the cancel method on a CompletableFuture returned by this API may not interrupt the underlying operation, but may be useful to complete, exceptionally, dependent stages that have not already completed.

Unless otherwise stated, null parameter values will cause methods of all classes in this package to throw NullPointerException.

Since:

11

• Exception Summary  Exception Description HttpConnectTimeoutException

  Thrown when a connection, over which an HttpRequest is intended to be sent, is not successfully established within a specified time period.

  HttpTimeoutException

  Thrown when a response is not received within a specified time period.

  WebSocketHandshakeException

  Thrown when the opening handshake has failed.

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For further API reference and developer documentation see the Java SE Documentation, which contains more detailed, developer-targeted descriptions with conceptual overviews, definitions of terms, workarounds, and working code examples.
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