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   /*
    * Copyright 2012 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.http.snoop;
  
  import io.netty.channel.ChannelHandlerContext;
  import io.netty.channel.SimpleChannelInboundHandler;
  import io.netty.handler.codec.http.HttpContent;
  import io.netty.handler.codec.http.HttpUtil;
  import io.netty.handler.codec.http.HttpObject;
  import io.netty.handler.codec.http.HttpResponse;
  import io.netty.handler.codec.http.LastHttpContent;
  import io.netty.util.CharsetUtil;
  
  public class HttpSnoopClientHandler extends SimpleChannelInboundHandler<HttpObject> {
  
      @Override
      public void channelRead0(ChannelHandlerContext ctx, HttpObject msg) {
          if (msg instanceof HttpResponse) {
              HttpResponse response = (HttpResponse) msg;
  
              System.err.println("STATUS: " + response.status());
              System.err.println("VERSION: " + response.protocolVersion());
              System.err.println();
  
              if (!response.headers().isEmpty()) {
                  for (CharSequence name: response.headers().names()) {
                      for (CharSequence value: response.headers().getAll(name)) {
                          System.err.println("HEADER: " + name + " = " + value);
                      }
                  }
                  System.err.println();
              }
  
              if (HttpUtil.isTransferEncodingChunked(response)) {
                  System.err.println("CHUNKED CONTENT {");
              } else {
                  System.err.println("CONTENT {");
              }
          }
          if (msg instanceof HttpContent) {
              HttpContent content = (HttpContent) msg;
  
              System.err.print(content.content().toString(CharsetUtil.UTF_8));
              System.err.flush();
  
              if (content instanceof LastHttpContent) {
                  System.err.println("} END OF CONTENT");
                  ctx.close();
              }
          }
      }
  
      @Override
      public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) {
          cause.printStackTrace();
          ctx.close();
      }
  }