/*
    * ====================================================================
    * 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/>.
   *
   */
  
  package org.apache.http.impl.nio.client;
  
  import java.net.ProxySelector;
  import java.util.Collection;
  import java.util.LinkedList;
  import java.util.concurrent.Executors;
  import java.util.concurrent.ThreadFactory;
  import java.util.concurrent.TimeUnit;
  
  import javax.net.ssl.HostnameVerifier;
  import javax.net.ssl.SSLContext;
  
  import org.apache.http.ConnectionReuseStrategy;
  import org.apache.http.Header;
  import org.apache.http.HttpHost;
  import org.apache.http.HttpRequestInterceptor;
  import org.apache.http.HttpResponseInterceptor;
  import org.apache.http.auth.AuthSchemeProvider;
  import org.apache.http.client.AuthenticationStrategy;
  import org.apache.http.client.CookieStore;
  import org.apache.http.client.CredentialsProvider;
  import org.apache.http.client.RedirectStrategy;
  import org.apache.http.client.UserTokenHandler;
  import org.apache.http.client.config.AuthSchemes;
  import org.apache.http.client.config.CookieSpecs;
  import org.apache.http.client.config.RequestConfig;
  import org.apache.http.client.protocol.RequestAddCookies;
  import org.apache.http.client.protocol.RequestAuthCache;
  import org.apache.http.client.protocol.RequestClientConnControl;
  import org.apache.http.client.protocol.RequestDefaultHeaders;
  import org.apache.http.client.protocol.RequestExpectContinue;
  import org.apache.http.client.protocol.ResponseProcessCookies;
  import org.apache.http.config.ConnectionConfig;
  import org.apache.http.config.Lookup;
  import org.apache.http.config.RegistryBuilder;
  import org.apache.http.conn.ConnectionKeepAliveStrategy;
  import org.apache.http.conn.SchemePortResolver;
  import org.apache.http.conn.routing.HttpRoutePlanner;
  import org.apache.http.conn.ssl.DefaultHostnameVerifier;
  import org.apache.http.conn.ssl.X509HostnameVerifier;
  import org.apache.http.conn.util.PublicSuffixMatcher;
  import org.apache.http.conn.util.PublicSuffixMatcherLoader;
  import org.apache.http.cookie.CookieSpecProvider;
  import org.apache.http.impl.DefaultConnectionReuseStrategy;
  import org.apache.http.impl.NoConnectionReuseStrategy;
  import org.apache.http.impl.auth.BasicSchemeFactory;
  import org.apache.http.impl.auth.DigestSchemeFactory;
  import org.apache.http.impl.auth.KerberosSchemeFactory;
  import org.apache.http.impl.auth.NTLMSchemeFactory;
  import org.apache.http.impl.auth.SPNegoSchemeFactory;
  import org.apache.http.impl.client.BasicCookieStore;
  import org.apache.http.impl.client.BasicCredentialsProvider;
  import org.apache.http.impl.client.DefaultConnectionKeepAliveStrategy;
  import org.apache.http.impl.client.DefaultRedirectStrategy;
  import org.apache.http.impl.client.NoopUserTokenHandler;
  import org.apache.http.impl.client.ProxyAuthenticationStrategy;
  import org.apache.http.impl.client.SystemDefaultCredentialsProvider;
  import org.apache.http.impl.client.TargetAuthenticationStrategy;
  import org.apache.http.impl.conn.DefaultProxyRoutePlanner;
  import org.apache.http.impl.conn.DefaultRoutePlanner;
  import org.apache.http.impl.conn.DefaultSchemePortResolver;
  import org.apache.http.impl.conn.SystemDefaultDnsResolver;
  import org.apache.http.impl.conn.SystemDefaultRoutePlanner;
  import org.apache.http.impl.cookie.DefaultCookieSpecProvider;
  import org.apache.http.impl.cookie.IgnoreSpecProvider;
  import org.apache.http.impl.cookie.NetscapeDraftSpecProvider;
  import org.apache.http.impl.cookie.RFC6265CookieSpecProvider;
  import org.apache.http.impl.nio.conn.ManagedNHttpClientConnectionFactory;
  import org.apache.http.impl.nio.conn.PoolingNHttpClientConnectionManager;
  import org.apache.http.impl.nio.reactor.IOReactorConfig;
  import org.apache.http.nio.NHttpClientEventHandler;
  import org.apache.http.nio.conn.NHttpClientConnectionManager;
 import org.apache.http.nio.conn.NoopIOSessionStrategy;
 import org.apache.http.nio.conn.SchemeIOSessionStrategy;
 import org.apache.http.nio.conn.ssl.SSLIOSessionStrategy;
 import org.apache.http.nio.protocol.HttpAsyncRequestExecutor;
 import org.apache.http.nio.reactor.ConnectingIOReactor;
 import org.apache.http.protocol.HttpProcessor;
 import org.apache.http.protocol.HttpProcessorBuilder;
 import org.apache.http.protocol.RequestContent;
 import org.apache.http.protocol.RequestTargetHost;
 import org.apache.http.protocol.RequestUserAgent;
 import org.apache.http.ssl.SSLContexts;
 import org.apache.http.util.TextUtils;
 import org.apache.http.util.VersionInfo;
 
 /**
  * Builder for {@link CloseableHttpAsyncClient} instances.
  * <p>
  * When a particular component is not explicitly this class will
  * use its default implementation. System properties will be taken
  * into account when configuring the default implementations when
  * {@link #useSystemProperties()} method is called prior to calling
  * {@link #build()}.
  * <ul>
  *  <li>ssl.TrustManagerFactory.algorithm</li>
  *  <li>javax.net.ssl.trustStoreType</li>
  *  <li>javax.net.ssl.trustStore</li>
  *  <li>javax.net.ssl.trustStoreProvider</li>
  *  <li>javax.net.ssl.trustStorePassword</li>
  *  <li>ssl.KeyManagerFactory.algorithm</li>
  *  <li>javax.net.ssl.keyStoreType</li>
  *  <li>javax.net.ssl.keyStore</li>
  *  <li>javax.net.ssl.keyStoreProvider</li>
  *  <li>javax.net.ssl.keyStorePassword</li>
  *  <li>https.protocols</li>
  *  <li>https.cipherSuites</li>
  *  <li>http.proxyHost</li>
  *  <li>http.proxyPort</li>
  *  <li>http.keepAlive</li>
  *  <li>http.maxConnections</li>
  *  <li>http.agent</li>
  * </ul>
  * <p>
  * Please note that some settings used by this class can be mutually
  * exclusive and may not apply when building {@link CloseableHttpAsyncClient}
  * instances.
  *
  * @since 4.0
  */
 public class HttpAsyncClientBuilder {
 
     private NHttpClientConnectionManager connManager;
     private boolean connManagerShared;
     private SchemePortResolver schemePortResolver;
     private SchemeIOSessionStrategy sslStrategy;
     private HostnameVerifier hostnameVerifier;
     private SSLContext sslcontext;
     private ConnectionReuseStrategy reuseStrategy;
     private ConnectionKeepAliveStrategy keepAliveStrategy;
     private AuthenticationStrategy targetAuthStrategy;
     private AuthenticationStrategy proxyAuthStrategy;
     private UserTokenHandler userTokenHandler;
     private HttpProcessor httpprocessor;
 
     private LinkedList<HttpRequestInterceptor> requestFirst;
     private LinkedList<HttpRequestInterceptor> requestLast;
     private LinkedList<HttpResponseInterceptor> responseFirst;
     private LinkedList<HttpResponseInterceptor> responseLast;
 
     private HttpRoutePlanner routePlanner;
     private RedirectStrategy redirectStrategy;
     private Lookup<AuthSchemeProvider> authSchemeRegistry;
     private Lookup<CookieSpecProvider> cookieSpecRegistry;
     private CookieStore cookieStore;
     private CredentialsProvider credentialsProvider;
     private String userAgent;
     private HttpHost proxy;
     private Collection<? extends Header> defaultHeaders;
     private IOReactorConfig defaultIOReactorConfig;
     private ConnectionConfig defaultConnectionConfig;
     private RequestConfig defaultRequestConfig;
 
     private ThreadFactory threadFactory;
     private NHttpClientEventHandler eventHandler;
 
     private PublicSuffixMatcher publicSuffixMatcher;
 
     private boolean systemProperties;
     private boolean cookieManagementDisabled;
     private boolean authCachingDisabled;
     private boolean connectionStateDisabled;
 
     private int maxConnTotal = 0;
     private int maxConnPerRoute = 0;
     private long connTimeToLive = -1;
     private TimeUnit connTimeToLiveTimeUnit = TimeUnit.MILLISECONDS;
 
     public static HttpAsyncClientBuilder create() {
         return new HttpAsyncClientBuilder();
     }
 
     protected HttpAsyncClientBuilder() {
         super();
     }
 
     /**
      * Assigns file containing public suffix matcher. Instances of this class can be created
      * with {@link org.apache.http.conn.util.PublicSuffixMatcherLoader}.
      *
      * @see org.apache.http.conn.util.PublicSuffixMatcher
      * @see org.apache.http.conn.util.PublicSuffixMatcherLoader
      *
      *   @since 4.1
      */
     public final HttpAsyncClientBuilder setPublicSuffixMatcher(final PublicSuffixMatcher publicSuffixMatcher) {
         this.publicSuffixMatcher = publicSuffixMatcher;
         return this;
     }
 
     /**
      * Assigns {@link NHttpClientConnectionManager} instance.
      */
     public final HttpAsyncClientBuilder setConnectionManager(
             final NHttpClientConnectionManager connManager) {
         this.connManager = connManager;
         return this;
     }
 
     /**
      * Defines the connection manager is to be shared by multiple
      * client instances.
      * <p>
      * If the connection manager is shared its life-cycle is expected
      * to be managed by the caller and it will not be shut down
      * if the client is closed.
      *
      * @param shared defines whether or not the connection manager can be shared
      *  by multiple clients.
      *
      * @since 4.1
      */
     public final HttpAsyncClientBuilder setConnectionManagerShared(
             final boolean shared) {
         this.connManagerShared = shared;
         return this;
     }
 
     /**
      * Assigns {@link SchemePortResolver} instance.
      */
     public final HttpAsyncClientBuilder setSchemePortResolver(
             final SchemePortResolver schemePortResolver) {
         this.schemePortResolver = schemePortResolver;
         return this;
     }
 
     /**
      * Assigns maximum total connection value.
      * <p>
      * Please note this value can be overridden by the {@link #setConnectionManager(
      *   org.apache.http.nio.conn.NHttpClientConnectionManager)} method.
      */
     public final HttpAsyncClientBuilder setMaxConnTotal(final int maxConnTotal) {
         this.maxConnTotal = maxConnTotal;
         return this;
     }
 
     /**
      * Assigns maximum connection per route value.
      * <p>
      * Please note this value can be overridden by the {@link #setConnectionManager(
      *   org.apache.http.nio.conn.NHttpClientConnectionManager)} method.
      */
     public final HttpAsyncClientBuilder setMaxConnPerRoute(final int maxConnPerRoute) {
         this.maxConnPerRoute = maxConnPerRoute;
         return this;
     }
 
     /**
      * Sets maximum time to live for persistent connections
      * <p>
      * Please note this value can be overridden by the {@link #setConnectionManager(
      *   org.apache.http.nio.conn.NHttpClientConnectionManager)} method.
      *
      * @since 4.1
      */
     public final HttpAsyncClientBuilder setConnectionTimeToLive(final long connTimeToLive, final TimeUnit connTimeToLiveTimeUnit) {
         this.connTimeToLive = connTimeToLive;
         this.connTimeToLiveTimeUnit = connTimeToLiveTimeUnit;
         return this;
     }
 
     /**
      * Assigns {@link ConnectionReuseStrategy} instance.
      */
     public final HttpAsyncClientBuilder setConnectionReuseStrategy(
             final ConnectionReuseStrategy reuseStrategy) {
         this.reuseStrategy = reuseStrategy;
         return this;
     }
 
     /**
      * Assigns {@link ConnectionKeepAliveStrategy} instance.
      */
     public final HttpAsyncClientBuilder setKeepAliveStrategy(
             final ConnectionKeepAliveStrategy keepAliveStrategy) {
         this.keepAliveStrategy = keepAliveStrategy;
         return this;
     }
 
     /**
      * Assigns {@link UserTokenHandler} instance.
      * <p>
      * Please note this value can be overridden by the {@link #disableConnectionState()}
      * method.
      */
     public final HttpAsyncClientBuilder setUserTokenHandler(final UserTokenHandler userTokenHandler) {
         this.userTokenHandler = userTokenHandler;
         return this;
     }
 
     /**
      * Assigns {@link AuthenticationStrategy} instance for proxy
      * authentication.
      */
     public final HttpAsyncClientBuilder setTargetAuthenticationStrategy(
             final AuthenticationStrategy targetAuthStrategy) {
         this.targetAuthStrategy = targetAuthStrategy;
         return this;
     }
 
     /**
      * Assigns {@link AuthenticationStrategy} instance for target
      * host authentication.
      */
     public final HttpAsyncClientBuilder setProxyAuthenticationStrategy(
             final AuthenticationStrategy proxyAuthStrategy) {
         this.proxyAuthStrategy = proxyAuthStrategy;
         return this;
     }
 
     /**
      * Assigns {@link HttpProcessor} instance.
      */
     public final HttpAsyncClientBuilder setHttpProcessor(final HttpProcessor httpprocessor) {
         this.httpprocessor = httpprocessor;
         return this;
     }
 
     /**
      * Adds this protocol interceptor to the head of the protocol processing list.
      * <p>
      * Please note this value can be overridden by the {@link #setHttpProcessor(
      * org.apache.http.protocol.HttpProcessor)} method.
      */
     public final HttpAsyncClientBuilder addInterceptorFirst(final HttpResponseInterceptor itcp) {
         if (itcp == null) {
             return this;
         }
         if (responseFirst == null) {
             responseFirst = new LinkedList<HttpResponseInterceptor>();
         }
         responseFirst.addFirst(itcp);
         return this;
     }
 
     /**
      * Adds this protocol interceptor to the tail of the protocol processing list.
      * <p>
      * Please note this value can be overridden by the {@link #setHttpProcessor(
      * org.apache.http.protocol.HttpProcessor)} method.
      */
     public final HttpAsyncClientBuilder addInterceptorLast(final HttpResponseInterceptor itcp) {
         if (itcp == null) {
             return this;
         }
         if (responseLast == null) {
             responseLast = new LinkedList<HttpResponseInterceptor>();
         }
         responseLast.addLast(itcp);
         return this;
     }
 
     /**
      * Adds this protocol interceptor to the head of the protocol processing list.
      * <p>
      * Please note this value can be overridden by the {@link #setHttpProcessor(
      * org.apache.http.protocol.HttpProcessor)} method.
      */
     public final HttpAsyncClientBuilder addInterceptorFirst(final HttpRequestInterceptor itcp) {
         if (itcp == null) {
             return this;
         }
         if (requestFirst == null) {
             requestFirst = new LinkedList<HttpRequestInterceptor>();
         }
         requestFirst.addFirst(itcp);
         return this;
     }
 
     /**
      * Adds this protocol interceptor to the tail of the protocol processing list.
      * <p>
      * Please note this value can be overridden by the {@link #setHttpProcessor(
      * org.apache.http.protocol.HttpProcessor)} method.
      */
     public final HttpAsyncClientBuilder addInterceptorLast(final HttpRequestInterceptor itcp) {
         if (itcp == null) {
             return this;
         }
         if (requestLast == null) {
             requestLast = new LinkedList<HttpRequestInterceptor>();
         }
         requestLast.addLast(itcp);
         return this;
     }
 
     /**
      * Assigns {@link HttpRoutePlanner} instance.
      */
     public final HttpAsyncClientBuilder setRoutePlanner(final HttpRoutePlanner routePlanner) {
         this.routePlanner = routePlanner;
         return this;
     }
 
     /**
      * Assigns {@link RedirectStrategy} instance.
      */
     public final HttpAsyncClientBuilder setRedirectStrategy(final RedirectStrategy redirectStrategy) {
         this.redirectStrategy = redirectStrategy;
         return this;
     }
 
     /**
      * Assigns default {@link CookieStore} instance which will be used for
      * request execution if not explicitly set in the client execution context.
      */
     public final HttpAsyncClientBuilder setDefaultCookieStore(final CookieStore cookieStore) {
         this.cookieStore = cookieStore;
         return this;
     }
 
     /**
      * Assigns default {@link CredentialsProvider} instance which will be used
      * for request execution if not explicitly set in the client execution
      * context.
      */
     public final HttpAsyncClientBuilder setDefaultCredentialsProvider(
             final CredentialsProvider credentialsProvider) {
         this.credentialsProvider = credentialsProvider;
         return this;
     }
 
 
     /**
      * Assigns default {@link org.apache.http.auth.AuthScheme} registry which will
      * be used for request execution if not explicitly set in the client execution
      * context.
      */
     public final HttpAsyncClientBuilder setDefaultAuthSchemeRegistry(
             final Lookup<AuthSchemeProvider> authSchemeRegistry) {
         this.authSchemeRegistry = authSchemeRegistry;
         return this;
     }
 
     /**
      * Assigns default {@link org.apache.http.cookie.CookieSpec} registry which will
      * be used for request execution if not explicitly set in the client execution
      * context.
      */
     public final HttpAsyncClientBuilder setDefaultCookieSpecRegistry(
             final Lookup<CookieSpecProvider> cookieSpecRegistry) {
         this.cookieSpecRegistry = cookieSpecRegistry;
         return this;
     }
 
     /**
      * Assigns {@code User-Agent} value.
      * <p>
      * Please note this value can be overridden by the {@link #setHttpProcessor(
      * org.apache.http.protocol.HttpProcessor)} method.
      */
     public final HttpAsyncClientBuilder setUserAgent(final String userAgent) {
         this.userAgent = userAgent;
         return this;
     }
 
     /**
      * Assigns default proxy value.
      * <p>
      * Please note this value can be overridden by the {@link #setRoutePlanner(
      *   org.apache.http.conn.routing.HttpRoutePlanner)} method.
      */
     public final HttpAsyncClientBuilder setProxy(final HttpHost proxy) {
         this.proxy = proxy;
         return this;
     }
 
     /**
      * Assigns {@link SchemeIOSessionStrategy} instance.
      * <p>
      * Please note this value can be overridden by the {@link #setConnectionManager(
      *   org.apache.http.nio.conn.NHttpClientConnectionManager)} method.
      */
     public final HttpAsyncClientBuilder setSSLStrategy(final SchemeIOSessionStrategy strategy) {
         this.sslStrategy = strategy;
         return this;
     }
 
     /**
      * Assigns {@link SSLContext} instance.
      * <p>
      * Please note this value can be overridden by the {@link #setConnectionManager(
      *   org.apache.http.nio.conn.NHttpClientConnectionManager)} and the {@link #setSSLStrategy(
      *   org.apache.http.nio.conn.SchemeIOSessionStrategy)} methods.
      */
     public final HttpAsyncClientBuilder setSSLContext(final SSLContext sslcontext) {
         this.sslcontext = sslcontext;
         return this;
     }
 
     /**
      * Assigns {@link X509HostnameVerifier} instance.
      * <p>
      * Please note this value can be overridden by the {@link #setConnectionManager(
      *   org.apache.http.nio.conn.NHttpClientConnectionManager)} and the {@link #setSSLStrategy(
      *   org.apache.http.nio.conn.SchemeIOSessionStrategy)} methods.
      *
      * @deprecated (4.1) use {@link #setSSLHostnameVerifier(javax.net.ssl.HostnameVerifier)}
      */
     @Deprecated
     public final HttpAsyncClientBuilder setHostnameVerifier(final X509HostnameVerifier hostnameVerifier) {
         this.hostnameVerifier = hostnameVerifier;
         return this;
     }
 
     /**
      * Assigns {@link javax.net.ssl.HostnameVerifier} instance.
      * <p>
      * Please note this value can be overridden by the {@link #setConnectionManager(
      *   org.apache.http.nio.conn.NHttpClientConnectionManager)} and the {@link #setSSLStrategy(
      *   org.apache.http.nio.conn.SchemeIOSessionStrategy)} methods.
      *
      * @since 4.1
      */
     public final HttpAsyncClientBuilder setSSLHostnameVerifier(final HostnameVerifier hostnameVerifier) {
         this.hostnameVerifier = hostnameVerifier;
         return this;
     }
 
     /**
      * Assigns default request header values.
      * <p>
      * Please note this value can be overridden by the {@link #setHttpProcessor(
      * org.apache.http.protocol.HttpProcessor)} method.
      */
     public final HttpAsyncClientBuilder setDefaultHeaders(final Collection<? extends Header> defaultHeaders) {
         this.defaultHeaders = defaultHeaders;
         return this;
     }
 
     /**
      * Assigns default {@link IOReactorConfig}.
      * <p>
      * Please note this value can be overridden by the {@link #setConnectionManager(
      *   org.apache.http.nio.conn.NHttpClientConnectionManager)} method.
      */
     public final HttpAsyncClientBuilder setDefaultIOReactorConfig(final IOReactorConfig config) {
         this.defaultIOReactorConfig = config;
         return this;
     }
 
     /**
      * Assigns default {@link ConnectionConfig}.
      * <p>
      * Please note this value can be overridden by the {@link #setConnectionManager(
      *   org.apache.http.nio.conn.NHttpClientConnectionManager)} method.
      */
     public final HttpAsyncClientBuilder setDefaultConnectionConfig(final ConnectionConfig config) {
         this.defaultConnectionConfig = config;
         return this;
     }
 
     /**
      * Assigns default {@link RequestConfig} instance which will be used
      * for request execution if not explicitly set in the client execution
      * context.
      */
     public final HttpAsyncClientBuilder setDefaultRequestConfig(final RequestConfig config) {
         this.defaultRequestConfig = config;
         return this;
     }
 
     /**
      * Assigns {@link ThreadFactory} instance.
      */
     public final HttpAsyncClientBuilder setThreadFactory(final ThreadFactory threadFactory) {
         this.threadFactory = threadFactory;
         return this;
     }
 
     /**
      * Assigns {@link NHttpClientEventHandler} instance.
      *
      * @since 4.1
      */
     public final HttpAsyncClientBuilder setEventHandler(final NHttpClientEventHandler eventHandler) {
         this.eventHandler = eventHandler;
         return this;
     }
 
     /**
      * Disables connection state tracking.
      */
     public final HttpAsyncClientBuilder disableConnectionState() {
         connectionStateDisabled = true;
         return this;
     }
 
     /**
      * Disables state (cookie) management.
      * <p>
      * Please note this value can be overridden by the {@link #setHttpProcessor(
      * org.apache.http.protocol.HttpProcessor)} method.
      */
     public final HttpAsyncClientBuilder disableCookieManagement() {
         cookieManagementDisabled = true;
         return this;
     }
 
     /**
      * Disables authentication scheme caching.
      * <p>
      * Please note this value can be overridden by the {@link #setHttpProcessor(
      * org.apache.http.protocol.HttpProcessor)} method.
      */
     public final HttpAsyncClientBuilder disableAuthCaching() {
         authCachingDisabled = true;
         return this;
     }
 
     /**
      * Use system properties when creating and configuring default
      * implementations.
      */
     public final HttpAsyncClientBuilder useSystemProperties() {
         systemProperties = true;
         return this;
     }
 
     private static String[] split(final String s) {
         if (TextUtils.isBlank(s)) {
             return null;
         }
         return s.split(" *, *");
     }
 
     public CloseableHttpAsyncClient build() {
 
         PublicSuffixMatcher publicSuffixMatcher = this.publicSuffixMatcher;
         if (publicSuffixMatcher == null) {
             publicSuffixMatcher = PublicSuffixMatcherLoader.getDefault();
         }
 
         NHttpClientConnectionManager connManager = this.connManager;
         if (connManager == null) {
             SchemeIOSessionStrategy sslStrategy = this.sslStrategy;
             if (sslStrategy == null) {
                 SSLContext sslcontext = this.sslcontext;
                 if (sslcontext == null) {
                     if (systemProperties) {
                         sslcontext = SSLContexts.createSystemDefault();
                     } else {
                         sslcontext = SSLContexts.createDefault();
                     }
                 }
                 final String[] supportedProtocols = systemProperties ? split(
                         System.getProperty("https.protocols")) : null;
                 final String[] supportedCipherSuites = systemProperties ? split(
                         System.getProperty("https.cipherSuites")) : null;
                 HostnameVerifier hostnameVerifier = this.hostnameVerifier;
                 if (hostnameVerifier == null) {
                     hostnameVerifier = new DefaultHostnameVerifier(publicSuffixMatcher);
                 }
                 sslStrategy = new SSLIOSessionStrategy(
                         sslcontext, supportedProtocols, supportedCipherSuites, hostnameVerifier);
             }
             final ConnectingIOReactor ioReactor = IOReactorUtils.create(
                 defaultIOReactorConfig != null ? defaultIOReactorConfig : IOReactorConfig.DEFAULT, threadFactory);
             final PoolingNHttpClientConnectionManagerionManager.html#PoolingNHttpClientConnectionManager">PoolingNHttpClientConnectionManager poolingmgr = new PoolingNHttpClientConnectionManager(
                     ioReactor,
                     ManagedNHttpClientConnectionFactory.INSTANCE,
                     RegistryBuilder.<SchemeIOSessionStrategy>create()
                         .register("http", NoopIOSessionStrategy.INSTANCE)
                         .register("https", sslStrategy)
                         .build(),
                     DefaultSchemePortResolver.INSTANCE,
                     SystemDefaultDnsResolver.INSTANCE,
                     connTimeToLive,
                     connTimeToLiveTimeUnit);
             if (defaultConnectionConfig != null) {
                 poolingmgr.setDefaultConnectionConfig(defaultConnectionConfig);
             }
             if (systemProperties) {
                 String s = System.getProperty("http.keepAlive", "true");
                 if ("true".equalsIgnoreCase(s)) {
                     s = System.getProperty("http.maxConnections", "5");
                     final int max = Integer.parseInt(s);
                     poolingmgr.setDefaultMaxPerRoute(max);
                     poolingmgr.setMaxTotal(2 * max);
                 }
             } else {
                 if (maxConnTotal > 0) {
                     poolingmgr.setMaxTotal(maxConnTotal);
                 }
                 if (maxConnPerRoute > 0) {
                     poolingmgr.setDefaultMaxPerRoute(maxConnPerRoute);
                 }
             }
             connManager = poolingmgr;
         }
         ConnectionReuseStrategy reuseStrategy = this.reuseStrategy;
         if (reuseStrategy == null) {
             if (systemProperties) {
                 final String s = System.getProperty("http.keepAlive", "true");
                 if ("true".equalsIgnoreCase(s)) {
                     reuseStrategy = DefaultConnectionReuseStrategy.INSTANCE;
                 } else {
                     reuseStrategy = NoConnectionReuseStrategy.INSTANCE;
                 }
             } else {
                 reuseStrategy = DefaultConnectionReuseStrategy.INSTANCE;
             }
         }
         ConnectionKeepAliveStrategy keepAliveStrategy = this.keepAliveStrategy;
         if (keepAliveStrategy == null) {
             keepAliveStrategy = DefaultConnectionKeepAliveStrategy.INSTANCE;
         }
         AuthenticationStrategy targetAuthStrategy = this.targetAuthStrategy;
         if (targetAuthStrategy == null) {
             targetAuthStrategy = TargetAuthenticationStrategy.INSTANCE;
         }
         AuthenticationStrategy proxyAuthStrategy = this.proxyAuthStrategy;
         if (proxyAuthStrategy == null) {
             proxyAuthStrategy = ProxyAuthenticationStrategy.INSTANCE;
         }
         UserTokenHandler userTokenHandler = this.userTokenHandler;
         if (userTokenHandler == null) {
             if (!connectionStateDisabled) {
                 userTokenHandler = DefaultAsyncUserTokenHandler.INSTANCE;
             } else {
                 userTokenHandler = NoopUserTokenHandler.INSTANCE;
             }
         }
         SchemePortResolver schemePortResolver = this.schemePortResolver;
         if (schemePortResolver == null) {
             schemePortResolver = DefaultSchemePortResolver.INSTANCE;
         }
 
         HttpProcessor httpprocessor = this.httpprocessor;
         if (httpprocessor == null) {
 
             String userAgent = this.userAgent;
             if (userAgent == null) {
                 if (systemProperties) {
                     userAgent = System.getProperty("http.agent");
                 }
                 if (userAgent == null) {
                     userAgent = VersionInfo.getUserAgent(
                             "Apache-HttpAsyncClient",
                             "org.apache.http.nio.client", getClass());
                 }
             }
 
             final HttpProcessorBuilder b = HttpProcessorBuilder.create();
             if (requestFirst != null) {
                 for (final HttpRequestInterceptor i: requestFirst) {
                     b.addFirst(i);
                 }
             }
             if (responseFirst != null) {
                 for (final HttpResponseInterceptor i: responseFirst) {
                     b.addFirst(i);
                 }
             }
             b.addAll(
                     new RequestDefaultHeaders(defaultHeaders),
                     new RequestContent(),
                     new RequestTargetHost(),
                     new RequestClientConnControl(),
                     new RequestUserAgent(userAgent),
                     new RequestExpectContinue());
             if (!cookieManagementDisabled) {
                 b.add(new RequestAddCookies());
             }
             if (!authCachingDisabled) {
                 b.add(new RequestAuthCache());
             }
             if (!cookieManagementDisabled) {
                 b.add(new ResponseProcessCookies());
             }
             if (requestLast != null) {
                 for (final HttpRequestInterceptor i: requestLast) {
                     b.addLast(i);
                 }
             }
             if (responseLast != null) {
                 for (final HttpResponseInterceptor i: responseLast) {
                     b.addLast(i);
                 }
             }
             httpprocessor = b.build();
         }
         // Add redirect executor, if not disabled
         HttpRoutePlanner routePlanner = this.routePlanner;
         if (routePlanner == null) {
             if (proxy != null) {
                 routePlanner = new DefaultProxyRoutePlanner(proxy, schemePortResolver);
             } else if (systemProperties) {
                 routePlanner = new SystemDefaultRoutePlanner(
                         schemePortResolver, ProxySelector.getDefault());
             } else {
                 routePlanner = new DefaultRoutePlanner(schemePortResolver);
             }
         }
         Lookup<AuthSchemeProvider> authSchemeRegistry = this.authSchemeRegistry;
         if (authSchemeRegistry == null) {
             authSchemeRegistry = RegistryBuilder.<AuthSchemeProvider>create()
                 .register(AuthSchemes.BASIC, new BasicSchemeFactory())
                 .register(AuthSchemes.DIGEST, new DigestSchemeFactory())
                 .register(AuthSchemes.NTLM, new NTLMSchemeFactory())
                 .register(AuthSchemes.SPNEGO, new SPNegoSchemeFactory())
                 .register(AuthSchemes.KERBEROS, new KerberosSchemeFactory())
                 .build();
         }
         Lookup<CookieSpecProvider> cookieSpecRegistry = this.cookieSpecRegistry;
         if (cookieSpecRegistry == null) {
             final CookieSpecProvider defaultProvider = new DefaultCookieSpecProvider(publicSuffixMatcher);
             final CookieSpecProvider laxStandardProvider = new RFC6265CookieSpecProvider(
                     RFC6265CookieSpecProvider.CompatibilityLevel.RELAXED, publicSuffixMatcher);
             final CookieSpecProvider strictStandardProvider = new RFC6265CookieSpecProvider(
                     RFC6265CookieSpecProvider.CompatibilityLevel.STRICT, publicSuffixMatcher);
             cookieSpecRegistry = RegistryBuilder.<CookieSpecProvider>create()
                     .register(CookieSpecs.DEFAULT, defaultProvider)
                     .register("best-match", defaultProvider)
                     .register("compatibility", defaultProvider)
                     .register(CookieSpecs.STANDARD, laxStandardProvider)
                     .register(CookieSpecs.STANDARD_STRICT, strictStandardProvider)
                     .register(CookieSpecs.NETSCAPE, new NetscapeDraftSpecProvider())
                     .register(CookieSpecs.IGNORE_COOKIES, new IgnoreSpecProvider())
                     .build();
         }
 
         CookieStore defaultCookieStore = this.cookieStore;
         if (defaultCookieStore == null) {
             defaultCookieStore = new BasicCookieStore();
         }
 
         CredentialsProvider defaultCredentialsProvider = this.credentialsProvider;
         if (defaultCredentialsProvider == null) {
             if (systemProperties) {
                 defaultCredentialsProvider = new SystemDefaultCredentialsProvider();
             } else {
                 defaultCredentialsProvider = new BasicCredentialsProvider();
             }
         }
         RedirectStrategy redirectStrategy = this.redirectStrategy;
         if (redirectStrategy == null) {
             redirectStrategy = DefaultRedirectStrategy.INSTANCE;
         }
 
         RequestConfig defaultRequestConfig = this.defaultRequestConfig;
         if (defaultRequestConfig == null) {
             defaultRequestConfig = RequestConfig.DEFAULT;
         }
 
         final MainClientExecent/MainClientExec.html#MainClientExec">MainClientExec exec = new MainClientExec(
             httpprocessor,
             routePlanner,
             redirectStrategy,
             targetAuthStrategy,
             proxyAuthStrategy,
             userTokenHandler);
 
         ThreadFactory threadFactory = null;
         NHttpClientEventHandler eventHandler = null;
         if (!this.connManagerShared) {
             threadFactory = this.threadFactory;
             if (threadFactory == null) {
                 threadFactory = Executors.defaultThreadFactory();
             }
             eventHandler = this.eventHandler;
             if (eventHandler == null) {
                 eventHandler = new HttpAsyncRequestExecutor();
             }
         }
         return new InternalHttpAsyncClient(
             connManager,
             reuseStrategy,
             keepAliveStrategy,
             threadFactory,
             eventHandler,
             exec,
             cookieSpecRegistry,
             authSchemeRegistry,
             defaultCookieStore,
             defaultCredentialsProvider,
             defaultRequestConfig);
     }
 
 }