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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
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  package org.apache.hc.client5.http.examples;
  
  import java.security.cert.X509Certificate;
  
  import javax.net.ssl.SSLContext;
  import javax.net.ssl.SSLSession;
  
  import org.apache.hc.client5.http.classic.methods.HttpGet;
  import org.apache.hc.client5.http.config.TlsConfig;
  import org.apache.hc.client5.http.impl.classic.CloseableHttpClient;
  import org.apache.hc.client5.http.impl.classic.HttpClients;
  import org.apache.hc.client5.http.impl.io.PoolingHttpClientConnectionManagerBuilder;
  import org.apache.hc.client5.http.io.HttpClientConnectionManager;
  import org.apache.hc.client5.http.protocol.HttpClientContext;
  import org.apache.hc.client5.http.ssl.DefaultClientTlsStrategy;
  import org.apache.hc.client5.http.ssl.TlsSocketStrategy;
  import org.apache.hc.core5.http.io.entity.EntityUtils;
  import org.apache.hc.core5.http.message.StatusLine;
  import org.apache.hc.core5.http.ssl.TLS;
  import org.apache.hc.core5.ssl.SSLContexts;
  import org.apache.hc.core5.util.Timeout;
  
  /**
   * This example demonstrates how to create secure connections with a custom SSL
   * context.
   */
  public class ClientCustomSSL {
  
      public final 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 TlsSocketStrategy tlsStrategy = new DefaultClientTlsStrategy(sslContext);
          // Allow TLSv1.3 protocol only
          final HttpClientConnectionManager cm = PoolingHttpClientConnectionManagerBuilder.create()
                  .setTlsSocketStrategy(tlsStrategy)
                  .setDefaultTlsConfig(TlsConfig.custom()
                          .setHandshakeTimeout(Timeout.ofSeconds(30))
                          .setSupportedProtocols(TLS.V_1_3)
                          .build())
                  .build();
          try (CloseableHttpClient httpclient = HttpClients.custom()
                  .setConnectionManager(cm)
                  .build()) {
  
              final HttpGet httpget = new HttpGet("https://httpbin.org/");
  
              System.out.println("Executing request " + httpget.getMethod() + " " + httpget.getUri());
  
              final HttpClientContext clientContext = HttpClientContext.create();
              httpclient.execute(httpget, clientContext, response -> {
                  System.out.println("----------------------------------------");
                  System.out.println(httpget + "->" + new StatusLine(response));
                  EntityUtils.consume(response.getEntity());
                  final SSLSession sslSession = clientContext.getSSLSession();
                  if (sslSession != null) {
                      System.out.println("SSL protocol " + sslSession.getProtocol());
                      System.out.println("SSL cipher suite " + sslSession.getCipherSuite());
                  }
                  return null;
              });
          }
     }
 
 }