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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.security.cert.X509Certificate;
  import java.util.concurrent.Future;
  
  import javax.net.ssl.SSLContext;
  import javax.net.ssl.SSLSession;
  
  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.impl.async.CloseableHttpAsyncClient;
  import org.apache.hc.client5.http.impl.async.HttpAsyncClients;
  import org.apache.hc.client5.http.impl.nio.PoolingAsyncClientConnectionManager;
  import org.apache.hc.client5.http.impl.nio.PoolingAsyncClientConnectionManagerBuilder;
  import org.apache.hc.client5.http.protocol.HttpClientContext;
  import org.apache.hc.client5.http.ssl.ClientTlsStrategyBuilder;
  import org.apache.hc.core5.concurrent.FutureCallback;
  import org.apache.hc.core5.http.HttpHost;
  import org.apache.hc.core5.http.message.StatusLine;
  import org.apache.hc.core5.http.nio.ssl.TlsStrategy;
  import org.apache.hc.core5.io.CloseMode;
  import org.apache.hc.core5.ssl.SSLContexts;
  
  /**
   * This example demonstrates how to create secure connections with a custom SSL
   * context.
   */
  public class AsyncClientCustomSSL {
  
      public static void main(final String[] args) throws Exception {
          // Trust standard CA and those trusted by our custom strategy
          final SSLContext sslContext = SSLContexts.custom()
                  // Custom TrustStrategy implementations are intended for verification
                  // of certificates whose CA is not trusted by the system, and where specifying
                  // a custom truststore containing the certificate chain is not an option.
                  .loadTrustMaterial((chain, authType) -> {
                      // Please note that validation of the server certificate without validation
                      // of the entire certificate chain in this example is preferred to completely
                      // disabling trust verification, however this still potentially allows
                      // for man-in-the-middle attacks.
                      final X509Certificate cert = chain[0];
                      return "CN=httpbin.org".equalsIgnoreCase(cert.getSubjectDN().getName());
                  })
                  .build();
          final TlsStrategy tlsStrategy = ClientTlsStrategyBuilder.create()
                  .setSslContext(sslContext)
                  .build();
  
          final PoolingAsyncClientConnectionManager cm = PoolingAsyncClientConnectionManagerBuilder.create()
                  .setTlsStrategy(tlsStrategy)
                  .build();
          try (final CloseableHttpAsyncClient client = HttpAsyncClients.custom()
                  .setConnectionManager(cm)
                  .build()) {
  
              client.start();
  
              final HttpHost target = new HttpHost("https", "httpbin.org");
              final HttpClientContext clientContext = HttpClientContext.create();
  
              final SimpleHttpRequest request = SimpleRequestBuilder.get()
                      .setHttpHost(target)
                      .setPath("/")
                      .build();
  
              System.out.println("Executing request " + request);
              final Future<SimpleHttpResponse> future = client.execute(
                      SimpleRequestProducer.create(request),
                      SimpleResponseConsumer.create(),
                      clientContext,
                     new FutureCallback<SimpleHttpResponse>() {
 
                         @Override
                         public void completed(final SimpleHttpResponse response) {
                             System.out.println(request + "->" + new StatusLine(response));
                             final SSLSession sslSession = clientContext.getSSLSession();
                             if (sslSession != null) {
                                 System.out.println("SSL protocol " + sslSession.getProtocol());
                                 System.out.println("SSL cipher suite " + sslSession.getCipherSuite());
                             }
                             System.out.println(response.getBody());
                         }
 
                         @Override
                         public void failed(final Exception ex) {
                             System.out.println(request + "->" + ex);
                         }
 
                         @Override
                         public void cancelled() {
                             System.out.println(request + " cancelled");
                         }
 
                     });
             future.get();
 
             System.out.println("Shutting down");
             client.close(CloseMode.GRACEFUL);
         }
     }
 
 }