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1   /*
2    * Copyright 2013 The Netty Project
3    *
4    * The Netty Project licenses this file to you under the Apache License,
5    * version 2.0 (the "License"); you may not use this file except in compliance
6    * with the License. You may obtain a copy of the License at:
7    *
8    *   http://www.apache.org/licenses/LICENSE-2.0
9    *
10   * Unless required by applicable law or agreed to in writing, software
11   * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
12   * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
13   * License for the specific language governing permissions and limitations
14   * under the License.
15   */
16  package io.netty.example.http.helloworld;
17  
18  import io.netty.buffer.Unpooled;
19  import io.netty.channel.ChannelFutureListener;
20  import io.netty.channel.ChannelHandlerAdapter;
21  import io.netty.channel.ChannelHandlerContext;
22  import io.netty.handler.codec.http.DefaultFullHttpResponse;
23  import io.netty.handler.codec.http.FullHttpResponse;
24  import io.netty.handler.codec.http.HttpHeaderUtil;
25  import io.netty.handler.codec.http.HttpHeaderValues;
26  import io.netty.handler.codec.http.HttpRequest;
27  
28  import static io.netty.handler.codec.http.HttpHeaderNames.*;
29  import static io.netty.handler.codec.http.HttpResponseStatus.*;
30  import static io.netty.handler.codec.http.HttpVersion.*;
31  
32  
33  public class HttpHelloWorldServerHandler extends ChannelHandlerAdapter {
34      private static final byte[] CONTENT = { 'H', 'e', 'l', 'l', 'o', ' ', 'W', 'o', 'r', 'l', 'd' };
35  
36      @Override
37      public void channelReadComplete(ChannelHandlerContext ctx) {
38          ctx.flush();
39      }
40  
41      @Override
42      public void channelRead(ChannelHandlerContext ctx, Object msg) {
43          if (msg instanceof HttpRequest) {
44              HttpRequest req = (HttpRequest) msg;
45  
46              if (HttpHeaderUtil.is100ContinueExpected(req)) {
47                  ctx.write(new DefaultFullHttpResponse(HTTP_1_1, CONTINUE));
48              }
49              boolean keepAlive = HttpHeaderUtil.isKeepAlive(req);
50              FullHttpResponse response = new DefaultFullHttpResponse(HTTP_1_1, OK, Unpooled.wrappedBuffer(CONTENT));
51              response.headers().set(CONTENT_TYPE, "text/plain");
52              response.headers().setInt(CONTENT_LENGTH, response.content().readableBytes());
53  
54              if (!keepAlive) {
55                  ctx.write(response).addListener(ChannelFutureListener.CLOSE);
56              } else {
57                  response.headers().set(CONNECTION, HttpHeaderValues.KEEP_ALIVE);
58                  ctx.write(response);
59              }
60          }
61      }
62  
63      @Override
64      public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) {
65          cause.printStackTrace();
66          ctx.close();
67      }
68  }