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What is the HTTP/2 client in Java 9?

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Java 9中的Http/2客户端是什么?

Http/2 Client APIIntroduced in Java 9. It has more performance improvements than Http/1.1 and also supports server-side push events. This makes the site efficient and faster to browse. Http/2 Client is an incubator module named jdk.incubator.httpclient, which means that all features are not finalized yet and new changes may be in the future of java appears in the version. It exports the jdk.incubator.http package that contains all public APIs.

To use the Http/2 client, we need to use the incubator module, we just need to use the "-add-modules" command to httpclient Module is passed into JShell as shown below

<strong>C:\>jshell -v --add-modules jdk.incubator.httpclient
| Welcome to JShell -- Version 9.0.4
| For an introduction type: /help intro</strong>

Example

<strong>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</strong>
<strong>
jshell> System.out.println(httpResponse.body());
Apache HTTP Server Test Page powered by CentOS
Testing 123..
<p class="lead">This page is used to test the proper operation of the Apache HTTP server after it has been insta
lled. If you can read this page it means that this site is working properly. Thi
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.com".
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<p>You should add your website content to the directory /var/www/html/.</p><p>To prevent this page from ever being used, follow the instructions in the file /etc/httpd/conf.d/welcome.conf.</p>Promoting Apache and CentOS
</strong><p><strong>You are free to use the images below
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