Java 9中的Http/2客戶端是什麼？

Http/2 Client API在 Java 9 中引入。它比 Http/1.1 具有更多效能改進，並且還支援伺服器端推送事件。這使得網站高效且更快瀏覽。 Http/2 Client是一個名為jdk.incubator.httpclient的孵化器模組strong>，這意味著所有功能還沒有最終確定，新的變化可能會在java 的未來版本中出現。它會匯出包含所有公共 API 的 jdk.incubator.http 套件。

要使用 Http/2 客戶端，我們需要使用孵化器模組，我們只需使用“–add-modules”命令將httpclient 模組傳遞到JShell 中，如下所示

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

範例

<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
s server is powered by CentOS.</p><p class="lead">The website you just visited is either experiencing problems or is undergoing routine maintenance.</p>If you would like to let the administrators of this website know that you&#39;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&#39;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?
<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
on Apache and CentOS Linux powered HTTP servers. Thanks for using Apache and CentOS!</strong></p>

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