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 * Copyright (c) 2015, 2018, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
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 *
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/**
 * <h2>HTTP Client and WebSocket APIs</h2>
 *
 * <p> Provides high-level client interfaces to HTTP (versions 1.1 and 2) and
 * low-level client interfaces to WebSocket. The main types defined are:
 *
 * <ul>
 *    <li>{@link java.net.http.HttpClient}</li>
 *    <li>{@link java.net.http.HttpRequest}</li>
 *    <li>{@link java.net.http.HttpResponse}</li>
 *    <li>{@link java.net.http.WebSocket}</li>
 * </ul>
 *
 * <p> The protocol-specific requirements are defined in the
 * <a href="https://tools.ietf.org/html/rfc7540">Hypertext Transfer Protocol
 * Version 2 (HTTP/2)</a>, the <a href="https://tools.ietf.org/html/rfc2616">
 * Hypertext Transfer Protocol (HTTP/1.1)</a>, and
 * <a href="https://tools.ietf.org/html/rfc6455">The WebSocket Protocol</a>.
 *
 * <p> In general, asynchronous tasks execute in either the thread invoking
 * the operation, e.g. {@linkplain HttpClient#send(HttpRequest, BodyHandler)
 * sending} an HTTP request, or by the threads supplied by the client's {@link
 * HttpClient#executor() executor}. Dependent tasks, those that are triggered by
 * returned CompletionStages or CompletableFutures, that do not explicitly
 * specify an executor, execute in the same {@link
 * CompletableFuture#defaultExecutor() default executor} as that of {@code
 * CompletableFuture}, or the invoking thread if the operation completes before
 * the dependent task is registered.
 *
 * <p> {@code CompletableFuture}s returned by this API will throw {@link
 * UnsupportedOperationException} for their {@link
 * CompletableFuture#obtrudeValue(Object) obtrudeValue}
 * and {@link CompletableFuture#obtrudeException(Throwable)
 * obtrudeException} methods. Invoking the {@link CompletableFuture#cancel
 * cancel} method on a {@code 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.
 *
 * <p> Unless otherwise stated, {@code null} parameter values will cause methods
 * of all classes in this package to throw {@code NullPointerException}.
 *
 * @since 11
 */
package java.net.http;

import java.lang.UnsupportedOperationException;
import java.net.http.HttpClient;
import java.net.http.HttpRequest;
import java.net.http.HttpResponse.BodyHandler;
import java.util.concurrent.CompletableFuture;