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    * Licensed to the Apache Software Foundation (ASF) under one
    * or more contributor license agreements.  See the NOTICE file
    * distributed with this work for additional information
    * regarding copyright ownership.  The ASF licenses this file
    * to you under the Apache License, Version 2.0 (the
    * "License"); you may not use this file except in compliance
    * with the License.  You may obtain a copy of the License at
   *
   *   http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing,
   * software distributed under the License is distributed on an
   * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
   * KIND, either express or implied.  See the License for the
   * specific language governing permissions and limitations
   * under the License.
   * ====================================================================
   *
   * This software consists of voluntary contributions made by many
   * individuals on behalf of the Apache Software Foundation.  For more
   * information on the Apache Software Foundation, please see
   * <http://www.apache.org/>.
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  package org.apache.hc.client5.http.examples;
  
  import java.util.concurrent.CountDownLatch;
  import java.util.concurrent.Future;
  import java.util.concurrent.TimeUnit;
  
  import org.apache.hc.client5.http.async.methods.SimpleHttpRequest;
  import org.apache.hc.client5.http.async.methods.SimpleHttpResponse;
  import org.apache.hc.client5.http.async.methods.SimpleRequestBuilder;
  import org.apache.hc.client5.http.async.methods.SimpleRequestProducer;
  import org.apache.hc.client5.http.async.methods.SimpleResponseConsumer;
  import org.apache.hc.client5.http.config.TlsConfig;
  import org.apache.hc.client5.http.impl.async.HttpAsyncClients;
  import org.apache.hc.client5.http.impl.async.MinimalHttpAsyncClient;
  import org.apache.hc.client5.http.impl.nio.PoolingAsyncClientConnectionManagerBuilder;
  import org.apache.hc.core5.concurrent.FutureCallback;
  import org.apache.hc.core5.http.HttpHost;
  import org.apache.hc.core5.http.config.Http1Config;
  import org.apache.hc.core5.http.message.StatusLine;
  import org.apache.hc.core5.http.nio.AsyncClientEndpoint;
  import org.apache.hc.core5.http2.HttpVersionPolicy;
  import org.apache.hc.core5.http2.config.H2Config;
  import org.apache.hc.core5.io.CloseMode;
  import org.apache.hc.core5.reactor.IOReactorConfig;
  
  /**
   * This example demonstrates concurrent (multiplexed) execution of multiple
   * HTTP/2 message exchanges.
   */
  public class AsyncClientH2Multiplexing {
  
      public static void main(final String[] args) throws Exception {
  
          final MinimalHttpAsyncClient client = HttpAsyncClients.createMinimal(
                  H2Config.DEFAULT,
                  Http1Config.DEFAULT,
                  IOReactorConfig.DEFAULT,
                  PoolingAsyncClientConnectionManagerBuilder.create()
                          .setDefaultTlsConfig(TlsConfig.custom()
                                  .setVersionPolicy(HttpVersionPolicy.FORCE_HTTP_2)
                                  .build())
                          .build());
  
          client.start();
  
          final HttpHost target = new HttpHost("https", "nghttp2.org");
          final Future<AsyncClientEndpoint> leaseFuture = client.lease(target, null);
          final AsyncClientEndpoint endpoint = leaseFuture.get(30, TimeUnit.SECONDS);
          try {
              final String[] requestUris = new String[] {"/httpbin/ip", "/httpbin/user-agent", "/httpbin/headers"};
  
              final CountDownLatch latch = new CountDownLatch(requestUris.length);
              for (final String requestUri: requestUris) {
                  final SimpleHttpRequest request = SimpleRequestBuilder.get()
                          .setHttpHost(target)
                          .setPath(requestUri)
                          .build();
  
                  System.out.println("Executing request " + request);
                  endpoint.execute(
                          SimpleRequestProducer.create(request),
                          SimpleResponseConsumer.create(),
                          new FutureCallback<SimpleHttpResponse>() {
  
                              @Override
                              public void completed(final SimpleHttpResponse response) {
                                  latch.countDown();
                                  System.out.println(request + "->" + new StatusLine(response));
                                  System.out.println(response.getBody());
                              }
  
                              @Override
                              public void failed(final Exception ex) {
                                 latch.countDown();
                                 System.out.println(request + "->" + ex);
                             }
 
                             @Override
                             public void cancelled() {
                                 latch.countDown();
                                 System.out.println(request + " cancelled");
                             }
 
                         });
             }
             latch.await();
         } finally {
             endpoint.releaseAndReuse();
         }
 
         System.out.println("Shutting down");
         client.close(CloseMode.GRACEFUL);
     }
 
 }