Does Apache or some other CLIENT JAVA implementation support HTTP/2?

Question

I\'m looking for java client that can connect to a HTTP/2 based server.. The server is already supporting HTTP/2 API. I don\'t see the most popular Apache Http client https://hc

Answer 1

Apache httpclient-5 beta supports http/2 from jdk9 or above

example :

public static void main(final String[] args) throws Exception {
    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", 8082, "https");
    final Future leaseFuture = client.lease(target, null);
    final AsyncClientEndpoint endpoint = leaseFuture.get(10, TimeUnit.SECONDS);
    try {
        String[] requestUris = new String[] {"/"};
        CountDownLatch latch = new CountDownLatch(requestUris.length);
        for (final String requestUri: requestUris) {
            SimpleHttpRequest request = SimpleHttpRequest.get(target, requestUri);
            endpoint.execute(SimpleRequestProducer.create(request), SimpleResponseConsumer.create(), new FutureCallback() {
                    @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);
}

refer : https://hc.apache.org/httpcomponents-client-5.0.x/examples-async.html