Jetty HTTP/2客户端接收服务器推送示例

Question

具有服务器推送支持的Jetty的HTTP/2客户端已在Jetty 9.3 RC(Link)中实现.但是,我没有找到任何与此相关的文档或示例代码.可以任何人提供示例代码,例如从该站点接收推送的资源:https://nghttp2.org(已启用http2服务器推送的公共服务器)

---更新1 --- 我试图测试这个文件,正如sbordet所说的那样.但是,在执行此行之后

mvn compile exec:java

我遇到了这个错误

[INFO] --- exec-maven-plugin:1.4.0:java (default-cli) @ http2client ---
2015-05-05 01:52:47.808:INFO::com.example.Client.main(): Logging initialized @3096ms
[WARNING]
java.lang.reflect.InvocationTargetException
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:483)
    at org.codehaus.mojo.exec.ExecJavaMojo$1.run(ExecJavaMojo.java:293)
    at java.lang.Thread.run(Thread.java:745)
Caused by: java.util.concurrent.TimeoutException
    at org.eclipse.jetty.util.FuturePromise.get(FuturePromise.java:130)
    at com.example.Client.main(Client.java:55)
    ... 6 more

这是我的 pom.xml

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.example</groupId>
<artifactId>http2client</artifactId>
<packaging>jar</packaging>
<version>1.0-SNAPSHOT</version>
<name>http2client</name>
<url>http://maven.apache.org</url>
<dependencies>
    <dependency>
        <groupId>org.eclipse.jetty.http2</groupId>
        <artifactId>http2-client</artifactId>
        <version>9.3.0.M2</version>
    </dependency>
    <dependency>
        <groupId>org.mortbay.jetty.alpn</groupId>
        <artifactId>alpn-boot</artifactId>
        <version>8.1.3.v20150130</version>
        <scope>runtime</scope>
    </dependency>
</dependencies>
<build>
    <plugins>
        <plugin>
            <groupId>org.codehaus.mojo</groupId>
            <artifactId>exec-maven-plugin</artifactId>
            <version>1.4.0</version>
            <executions>
                <execution>
                    <goals>
                        <goal>java</goal>
                    </goals>
                </execution>
            </executions>
            <configuration>
                <mainClass>com.example.Client</mainClass>
            </configuration>
        </plugin>
    </plugins>
</build>

这是我的项目目录

|-- pom.xml
|-- src
|   `-- main
|       `-- java
|           `-- com
|               `-- example
|                   `-- Client.java
`-- target
    |-- classes
    |   `-- com
    |       `-- example
    |           |-- Client$1.class
    |           `-- Client.class
    `-- maven-status
        `-- maven-compiler-plugin
            `-- compile
                `-- default-compile
                    |-- createdFiles.lst
                    `-- inputFiles.lst

---更新2 ---

将我的pom.xml <build>标记更改为:(显式使用JDK 8并添加-Xbootclasspath指向Jetty提供的alpn-boot.jar).我正在使用Java 8更新31

<build>
    <plugins>
        <plugin>
            <groupId>org.apache.maven.plugins</groupId>
            <artifactId>maven-compiler-plugin</artifactId>
            <version>3.1</version>
            <configuration>
                <source>1.8</source>
                <target>1.8</target>
            </configuration>
        </plugin>
        <plugin>
            <groupId>org.codehaus.mojo</groupId>
            <artifactId>exec-maven-plugin</artifactId>
            <version>1.4.0</version>
            <executions>
                <execution>
                    <goals>
                        <goal>exec</goal>
                    </goals>
                </execution>
            </executions>
            <configuration>
                <executable>java</executable>
                <arguments>
                    <argument>-Xbootclasspath/p:/path/to/alpn-boot-8.1.3.v20150130.jar</argument>
                    <argument>-classpath</argument>
                    <classpath/>
                    <argument>com.example.Client</argument>
                </arguments>
            </configuration>
        </plugin>
    </plugins>
</build>

执行此命令后:

mvn clean compile exec:exec

尝试连接到https://webtide.com/(Client.java文件中的默认主机)时出现此错误

[INFO] --- exec-maven-plugin:1.4.0:exec (default-cli) @ http2client ---
2015-05-05 13:19:25.499:INFO::main: Logging initialized @153ms
Exception in thread "main" java.util.concurrent.TimeoutException
    at org.eclipse.jetty.util.FuturePromise.get(FuturePromise.java:130)
    at com.example.Client.main(Client.java:55)

连接到https://nghttp2.org/时出现此错误

[INFO] --- exec-maven-plugin:1.4.0:exec (default-cli) @ http2client ---
2015-05-05 13:29:12.106:INFO::main: Logging initialized @196ms
Exception in thread "main" java.util.concurrent.TimeoutException
    at java.util.concurrent.Phaser.awaitAdvanceInterruptibly(Phaser.java:800)
    at com.example.Client.main(Client.java:90)

---更新3 ---

采取不同的方法:当我拉动整个jetty项目的所有主分支,然后创建一个Intellij项目,jetty.project/jetty-http2/http2-client然后它适用于公共服务器https://webtide.com和https://nghttp2.org.但是当我在我的自签名证书http2服务器上测试它时(使用nghttp2 + nginx,驻留在我的虚拟机中)然后我收到此错误

2015-05-05 19:05:25.094:INFO::main: Logging initialized @220ms
Exception in thread "main" java.util.concurrent.ExecutionException: java.nio.channels.ClosedChannelException
    at org.eclipse.jetty.util.FuturePromise.get(FuturePromise.java:138)
    at org.eclipse.jetty.http2.client.Client.main(Client.java:55)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:483)
    at com.intellij.rt.execution.application.AppMain.main(AppMain.java:140)
Caused by: java.nio.channels.ClosedChannelException
    at org.eclipse.jetty.http2.HTTP2Flusher.append(HTTP2Flusher.java:110)
    at org.eclipse.jetty.http2.HTTP2Session.frame(HTTP2Session.java:577)
    at org.eclipse.jetty.http2.HTTP2Session.frames(HTTP2Session.java:559)
    at org.eclipse.jetty.http2.client.HTTP2ClientConnectionFactory$HTTP2ClientConnection.onOpen(HTTP2ClientConnectionFactory.java:121)

Answer 1

问题中报告的链接提供了Jetty 的HTTP/2传输HttpClient。

JettyHttpClient向必须使用 HTTP 1.0、1.1 和 2.0 等的应用程序公开通用 HTTP APIHttpClient不会公开任何 API 来接收 HTTP/2 推送资源，因为这些只是 HTTP/2 的特殊机制。

如果你确实想与 HTTP/2 API 交互，你可以使用 Jetty 的HTTP2Client，它向应用程序公开特定于 HTTP/2 的较低级别 API。

您可以在此处找到连接到推送资源的网站（在本例中为https://webtide.com）的完整示例。