HTTP2 URL在浏览器中加载了成功，但在HTTPCLIENT中失败了

Question

我正在尝试创建一个httpclient 5示例，该示例使用asynchttpclient(asynchronous多路复用(加载URL，我已经配置了tomcat 9以接受使用CONF/SERVER的HTTTP2协议。XML配置如下

<Connector
       protocol="org.apache.coyote.http11.Http11NioProtocol"
       port="8443" maxThreads="200"
       scheme="https" secure="true" SSLEnabled="true"
       keystoreFile="conf/xxx.keystore" keystorePass="xxx#"
       clientAuth="false" sslProtocol="TLS"><UpgradeProtocol className="org.apache.coyote.http2.Http2Protocol"/></Connector>

和我的程序如下，

    final SSLContext sslContext = SSLContexts.custom().loadTrustMaterial(new TrustAllStrategy()).build();
    final PoolingAsyncClientConnectionManager connectionManager = PoolingAsyncClientConnectionManagerBuilder.create().setTlsStrategy(new H2TlsStrategy(sslContext, NoopHostnameVerifier.INSTANCE)).build();
    final IOReactorConfig ioReactorConfig = IOReactorConfig.custom().setSoTimeout(Timeout.ofSeconds(5)).build();
    final MinimalHttpAsyncClient client = HttpAsyncClients.createMinimal(HttpVersionPolicy.FORCE_HTTP_2, H2Config.DEFAULT, null, ioReactorConfig, connectionManager);

    client.start();
    final HttpHost target = new HttpHost("localhost", 8084, "https");
    System.out.println(target.getPort());
    final Future<AsyncClientEndpoint> leaseFuture = client.lease(target, null);
    final AsyncClientEndpoint endpoint = leaseFuture.get(45, TimeUnit.SECONDS);
    try {
        final String[] requestUris = new String[] {"/index.html"};
        final CountDownLatch latch = new CountDownLatch(requestUris.length);
        for (final String requestUri: requestUris) {
            final SimpleHttpRequest request = SimpleHttpRequest.get(target, requestUri);
            endpoint.execute(SimpleRequestProducer.create(request), SimpleResponseConsumer.create(), new FutureCallback<SimpleHttpResponse>() {
                        @Override
                        public void completed(final SimpleHttpResponse response) {
                            latch.countDown();
                            System.out.println(requestUri + "->" + response.getCode());
                            System.out.println(response.getBody());
                        }
                        @Override
                        public void failed(final Exception ex) {
                            latch.countDown();
                            System.out.println(requestUri + "->" + ex);
                            ex.printStackTrace();
                        }
                        @Override
                        public void cancelled() {
                            latch.countDown();
                            System.out.println(requestUri + " cancelled");
                        }
                    });
        }
        latch.await();
    } catch (Exception e) {
        e.printStackTrace();
    }finally {
        endpoint.releaseAndReuse();
    }
    client.shutdown(ShutdownType.GRACEFUL);

tomcat配置可作为带有H2协议的页面加载的页面加载，但使用httpclient 5失败，并具有以下异常

/index.html->org.apache.hc.core5.http.ConnectionClosedException: Connection closed
org.apache.hc.core5.http.ConnectionClosedException: Connection closed
    at org.apache.hc.core5.http2.impl.nio.FrameInputBuffer.read(FrameInputBuffer.java:146)
    at org.apache.hc.core5.http2.impl.nio.AbstractHttp2StreamMultiplexer.onInput(AbstractHttp2StreamMultiplexer.java:415)
    at org.apache.hc.core5.http2.impl.nio.AbstractHttp2IOEventHandler.inputReady(AbstractHttp2IOEventHandler.java:63)
    at org.apache.hc.core5.http2.impl.nio.ClientHttp2IOEventHandler.inputReady(ClientHttp2IOEventHandler.java:38)
    at org.apache.hc.core5.reactor.InternalDataChannel.onIOEvent(InternalDataChannel.java:117)
    at org.apache.hc.core5.reactor.InternalChannel.handleIOEvent(InternalChannel.java:50)
    at org.apache.hc.core5.reactor.SingleCoreIOReactor.processEvents(SingleCoreIOReactor.java:173)
    at org.apache.hc.core5.reactor.SingleCoreIOReactor.doExecute(SingleCoreIOReactor.java:123)
    at org.apache.hc.core5.reactor.AbstractSingleCoreIOReactor.execute(AbstractSingleCoreIOReactor.java:80)
    at org.apache.hc.core5.reactor.IOReactorWorker.run(IOReactorWorker.java:44)
    at java.lang.Thread.run(Thread.java:748)

对此的任何帮助将不胜感激

预先感谢

在启用tomcat日志时，我可以看到以下内容，

org.apache.coyote.abstractprotocol $ connectionhandler.process未能 为协商协议创建处理器[H2C]

当我将客户端代码更新为Java 9时，甚至可以解决此问题，但是可以使其与Java 8一起使用。

P.S：我知道Java 8不支持ALPN，但是让我知道我是否可以使其与Java 8一起使用。

Answer 1

通过使用conccrypt作为默认提供商，并使用自定义TLSStrategy，我们可以使其与JDK1.8一起使用，请参阅，

https://stackoverflow.com/a/53399363/2236001

Answer 2

我遇到了一个类似的问题，发现这是由于请求协议用作HTTPS。由于我已经为客户设定了TLS策略，因此将协议更改为简单的" HTTP"解决了问题。更换行：最终的httphost target = new httphost(" localhost"，8084，" https"(;经过 最终的httphost target = new httphost(" localhost"，8084，" http"(;