Http/2 Client API在 Java 9 中引入。它比 Http/1.1 具有更多性能改进，并且还支持服务器端推送事件。这使得网站高效且更快浏览。Http/2 Client是一个名为jdk.incubator.httpclient的孵化器模块strong>，这意味着所有功能还没有最终确定，新的变化可能会在 java 的未来版本中出现。它导出包含所有公共 API 的 jdk.incubator.http 包。
要使用 Http/2 客户端，我们需要使用 孵化器模块，我们只需使用“–add-modules”命令将httpclient 模块传递到 JShell 中，如下所示
C:>jshell -v --add-modules jdk.incubator.httpclient
| Welcome to JShell -- Version 9.0.4
| For an introduction type: /help intro
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示例
jshell> import jdk.incubator.http.*;
jshell> HttpClient httpClient = HttpClient.newHttpClient();
httpClient ==> jdk.incubator.http.HttpClientImpl@534df152
| created variable httpClient : HttpClient
jshell> HttpRequest httpRequest = HttpRequest.newBuilder().uri(new URI("https: //www.google.com")).GET().build();
httpRequest ==> https://www.google.com GET
| created variable httpRequest : HttpRequest
jshell> HttpResponse httpResponse = httpClient.send(httpRequest, HttpResponse.BodyHandler.asString());
httpResponse ==> jdk.incubator.http.HttpResponseImpl@609cd4d8
| created variable httpResponse : HttpResponse
jshell> System.out.println(httpResponse.statusCode());
403
jshell> System.out.println(httpResponse.body());
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