What is Http/2 Client in Java 9?

JavaObject Oriented ProgrammingProgramming

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

To use Http/2 Client, we need to use the incubator module, we simply pass the httpclient module into JShell using the "–add-modules" command as below

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


Example

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());
Apache HTTP Server Test Page powered by CentOS
Testing 123..

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 s server is powered by CentOS.

The website you just visited is either experiencing problems or is undergoing routine maintenance.

If you would like to let the administrators of this website know that you've seen this page instead of the page you expected, you should send them e-mail. In general, mail sent to the name "webmast er" and directed to the website's domain should reach the appropriate person.For example, if you experienced problems while visiting www.example.com, you should send e-mail to "webmaster@example .com". Are you the Administrator?

You should add your website content to the directory /var/www/html/.

To prevent this page from ever being used, follow the instructions in the file /etc/httpd/conf.d/welcome.conf.

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You are free to use the images below on Apache and CentOS Linux powered HTTP servers. Thanks for using Apache and CentOS!

raja
Published on 13-Mar-2020 13:20:28
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