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   /*
    * Copyright 2015 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.tiles;
  
  import static io.netty.handler.codec.http.HttpHeaderNames.CONNECTION;
  import static io.netty.handler.codec.http.HttpHeaderValues.CLOSE;
  import static io.netty.handler.codec.http.HttpHeaderValues.KEEP_ALIVE;
  import static io.netty.handler.codec.http.HttpUtil.isKeepAlive;
  import static io.netty.handler.codec.http.HttpResponseStatus.CONTINUE;
  import static io.netty.handler.codec.http.HttpVersion.HTTP_1_0;
  import static io.netty.handler.codec.http.HttpVersion.HTTP_1_1;
  
  import io.netty.buffer.Unpooled;
  import io.netty.channel.ChannelFutureListener;
  import io.netty.channel.ChannelHandlerContext;
  import io.netty.handler.codec.http.DefaultFullHttpResponse;
  import io.netty.handler.codec.http.FullHttpRequest;
  import io.netty.handler.codec.http.FullHttpResponse;
  import io.netty.handler.codec.http.HttpUtil;
  
  import java.util.concurrent.TimeUnit;
  
  /**
   * Handles the requests for the tiled image using HTTP 1.x as a protocol.
   */
  public final class Http1RequestHandler extends Http2RequestHandler {
  
      @Override
      protected void channelRead0(ChannelHandlerContext ctx, FullHttpRequest request) throws Exception {
          if (HttpUtil.is100ContinueExpected(request)) {
              ctx.write(new DefaultFullHttpResponse(HTTP_1_1, CONTINUE, Unpooled.EMPTY_BUFFER));
          }
          super.channelRead0(ctx, request);
      }
  
      @Override
      protected void sendResponse(final ChannelHandlerContext ctx, String streamId, int latency,
              final FullHttpResponse response, final FullHttpRequest request) {
          HttpUtil.setContentLength(response, response.content().readableBytes());
          ctx.executor().schedule(new Runnable() {
              @Override
              public void run() {
                  if (isKeepAlive(request)) {
                      if (request.protocolVersion().equals(HTTP_1_0)) {
                          response.headers().set(CONNECTION, KEEP_ALIVE);
                      }
                      ctx.writeAndFlush(response);
                  } else {
                      // Tell the client we're going to close the connection.
                      response.headers().set(CONNECTION, CLOSE);
                      ctx.writeAndFlush(response).addListener(ChannelFutureListener.CLOSE);
                  }
              }
          }, latency, TimeUnit.MILLISECONDS);
      }
  }