JDK14/Java14源码在线阅读

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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.
 *

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