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   /*
    * Copyright 2014 The Netty Project
    *
    * The Netty Project 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:
    *
    * https://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.
   */
  package io.netty.example.http2.helloworld.client;
  
  import io.netty.bootstrap.Bootstrap;
  import io.netty.buffer.Unpooled;
  import io.netty.channel.Channel;
  import io.netty.channel.ChannelOption;
  import io.netty.channel.EventLoopGroup;
  import io.netty.channel.nio.NioEventLoopGroup;
  import io.netty.channel.socket.nio.NioSocketChannel;
  import io.netty.handler.codec.http.DefaultFullHttpRequest;
  import io.netty.handler.codec.http.FullHttpRequest;
  import io.netty.handler.codec.http.HttpHeaderNames;
  import io.netty.handler.codec.http.HttpHeaderValues;
  import io.netty.handler.codec.http.HttpScheme;
  import io.netty.handler.codec.http2.Http2SecurityUtil;
  import io.netty.handler.codec.http2.HttpConversionUtil;
  import io.netty.handler.ssl.ApplicationProtocolConfig;
  import io.netty.handler.ssl.ApplicationProtocolConfig.Protocol;
  import io.netty.handler.ssl.ApplicationProtocolConfig.SelectedListenerFailureBehavior;
  import io.netty.handler.ssl.ApplicationProtocolConfig.SelectorFailureBehavior;
  import io.netty.handler.ssl.ApplicationProtocolNames;
  import io.netty.handler.ssl.OpenSsl;
  import io.netty.handler.ssl.SslContext;
  import io.netty.handler.ssl.SslContextBuilder;
  import io.netty.handler.ssl.SslProvider;
  import io.netty.handler.ssl.SupportedCipherSuiteFilter;
  import io.netty.handler.ssl.util.InsecureTrustManagerFactory;
  import io.netty.util.AsciiString;
  import io.netty.util.CharsetUtil;
  
  import java.util.concurrent.TimeUnit;
  
  import static io.netty.buffer.Unpooled.wrappedBuffer;
  import static io.netty.handler.codec.http.HttpMethod.GET;
  import static io.netty.handler.codec.http.HttpMethod.POST;
  import static io.netty.handler.codec.http.HttpVersion.HTTP_1_1;
  
  /**
   * An HTTP2 client that allows you to send HTTP2 frames to a server using HTTP1-style approaches
   * (via {@link io.netty.handler.codec.http2.InboundHttp2ToHttpAdapter}). Inbound and outbound
   * frames are logged.
   * When run from the command-line, sends a single HEADERS frame to the server and gets back
   * a "Hello World" response.
   * See the ./http2/helloworld/frame/client/ example for a HTTP2 client example which does not use
   * HTTP1-style objects and patterns.
   */
  public final class Http2Client {
  
      static final boolean SSL = System.getProperty("ssl") != null;
      static final String HOST = System.getProperty("host", "127.0.0.1");
      static final int PORT = Integer.parseInt(System.getProperty("port", SSL? "8443" : "8080"));
      static final String URL = System.getProperty("url", "/whatever");
      static final String URL2 = System.getProperty("url2");
      static final String URL2DATA = System.getProperty("url2data", "test data!");
  
      public static void main(String[] args) throws Exception {
          // Configure SSL.
          final SslContext sslCtx;
          if (SSL) {
              SslProvider provider = OpenSsl.isAlpnSupported() ? SslProvider.OPENSSL : SslProvider.JDK;
              sslCtx = SslContextBuilder.forClient()
                  .sslProvider(provider)
                  /* NOTE: the cipher filter may not include all ciphers required by the HTTP/2 specification.
                   * Please refer to the HTTP/2 specification for cipher requirements. */
                  .ciphers(Http2SecurityUtil.CIPHERS, SupportedCipherSuiteFilter.INSTANCE)
                  .trustManager(InsecureTrustManagerFactory.INSTANCE)
                  .applicationProtocolConfig(new ApplicationProtocolConfig(
                      Protocol.ALPN,
                      // NO_ADVERTISE is currently the only mode supported by both OpenSsl and JDK providers.
                      SelectorFailureBehavior.NO_ADVERTISE,
                      // ACCEPT is currently the only mode supported by both OpenSsl and JDK providers.
                      SelectedListenerFailureBehavior.ACCEPT,
                      ApplicationProtocolNames.HTTP_2,
                      ApplicationProtocolNames.HTTP_1_1))
                  .build();
          } else {
              sslCtx = null;
          }
  
          EventLoopGroup workerGroup = new NioEventLoopGroup();
          Http2ClientInitializer initializer = new Http2ClientInitializer(sslCtx, Integer.MAX_VALUE);
  
          try {
              // Configure the client.
              Bootstrap b = new Bootstrap();
             b.group(workerGroup);
             b.channel(NioSocketChannel.class);
             b.option(ChannelOption.SO_KEEPALIVE, true);
             b.remoteAddress(HOST, PORT);
             b.handler(initializer);
 
             // Start the client.
             Channel channel = b.connect().syncUninterruptibly().channel();
             System.out.println("Connected to [" + HOST + ':' + PORT + ']');
 
             // Wait for the HTTP/2 upgrade to occur.
             Http2SettingsHandler http2SettingsHandler = initializer.settingsHandler();
             http2SettingsHandler.awaitSettings(5, TimeUnit.SECONDS);
 
             HttpResponseHandler responseHandler = initializer.responseHandler();
             int streamId = 3;
             HttpScheme scheme = SSL ? HttpScheme.HTTPS : HttpScheme.HTTP;
             AsciiString hostName = new AsciiString(HOST + ':' + PORT);
             System.err.println("Sending request(s)...");
             if (URL != null) {
                 // Create a simple GET request.
                 FullHttpRequest request = new DefaultFullHttpRequest(HTTP_1_1, GET, URL, Unpooled.EMPTY_BUFFER);
                 request.headers().add(HttpHeaderNames.HOST, hostName);
                 request.headers().add(HttpConversionUtil.ExtensionHeaderNames.SCHEME.text(), scheme.name());
                 request.headers().add(HttpHeaderNames.ACCEPT_ENCODING, HttpHeaderValues.GZIP);
                 request.headers().add(HttpHeaderNames.ACCEPT_ENCODING, HttpHeaderValues.DEFLATE);
                 responseHandler.put(streamId, channel.write(request), channel.newPromise());
                 streamId += 2;
             }
             if (URL2 != null) {
                 // Create a simple POST request with a body.
                 FullHttpRequest request = new DefaultFullHttpRequest(HTTP_1_1, POST, URL2,
                         wrappedBuffer(URL2DATA.getBytes(CharsetUtil.UTF_8)));
                 request.headers().add(HttpHeaderNames.HOST, hostName);
                 request.headers().add(HttpConversionUtil.ExtensionHeaderNames.SCHEME.text(), scheme.name());
                 request.headers().add(HttpHeaderNames.ACCEPT_ENCODING, HttpHeaderValues.GZIP);
                 request.headers().add(HttpHeaderNames.ACCEPT_ENCODING, HttpHeaderValues.DEFLATE);
                 responseHandler.put(streamId, channel.write(request), channel.newPromise());
             }
             channel.flush();
             responseHandler.awaitResponses(5, TimeUnit.SECONDS);
             System.out.println("Finished HTTP/2 request(s)");
 
             // Wait until the connection is closed.
             channel.close().syncUninterruptibly();
         } finally {
             workerGroup.shutdownGracefully();
         }
     }
 }