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   /*
    * Copyright 2020 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.haproxy;
  
  import io.netty.bootstrap.Bootstrap;
  import io.netty.buffer.Unpooled;
  import io.netty.channel.Channel;
  import io.netty.channel.EventLoopGroup;
  import io.netty.channel.nio.NioEventLoopGroup;
  import io.netty.channel.socket.nio.NioSocketChannel;
  import io.netty.handler.codec.haproxy.HAProxyCommand;
  import io.netty.handler.codec.haproxy.HAProxyMessage;
  import io.netty.handler.codec.haproxy.HAProxyProtocolVersion;
  import io.netty.handler.codec.haproxy.HAProxyProxiedProtocol;
  import io.netty.util.CharsetUtil;
  
  import static io.netty.example.haproxy.HAProxyServer.*;
  
  public final class HAProxyClient {
  
      private static final String HOST = System.getProperty("host", "127.0.0.1");
  
      public static void main(String[] args) throws Exception {
          EventLoopGroup group = new NioEventLoopGroup();
          try {
              Bootstrap b = new Bootstrap();
              b.group(group)
               .channel(NioSocketChannel.class)
               .handler(new HAProxyHandler());
  
              // Start the connection attempt.
              Channel ch = b.connect(HOST, PORT).sync().channel();
  
              HAProxyMessage message = new HAProxyMessage(
                      HAProxyProtocolVersion.V2, HAProxyCommand.PROXY, HAProxyProxiedProtocol.TCP4,
                      "127.0.0.1", "127.0.0.2", 8000, 9000);
  
              ch.writeAndFlush(message).sync();
              ch.writeAndFlush(Unpooled.copiedBuffer("Hello World!", CharsetUtil.US_ASCII)).sync();
              ch.writeAndFlush(Unpooled.copiedBuffer("Bye now!", CharsetUtil.US_ASCII)).sync();
              ch.close().sync();
          } finally {
              group.shutdownGracefully();
          }
      }
  }