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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.ChannelHandlerContext;
21  import io.netty.channel.SimpleChannelInboundHandler;
22  import io.netty.handler.codec.http.DefaultFullHttpResponse;
23  import io.netty.handler.codec.http.FullHttpResponse;
24  import io.netty.handler.codec.http.HttpObject;
25  import io.netty.handler.codec.http.HttpUtil;
26  import io.netty.handler.codec.http.HttpRequest;
27  import io.netty.util.AsciiString;
28  
29  import static io.netty.handler.codec.http.HttpResponseStatus.*;
30  import static io.netty.handler.codec.http.HttpVersion.*;
31  
32  public class HttpHelloWorldServerHandler extends SimpleChannelInboundHandler<HttpObject> {
33      private static final byte[] CONTENT = { 'H', 'e', 'l', 'l', 'o', ' ', 'W', 'o', 'r', 'l', 'd' };
34  
35      private static final AsciiString CONTENT_TYPE = AsciiString.cached("Content-Type");
36      private static final AsciiString CONTENT_LENGTH = AsciiString.cached("Content-Length");
37      private static final AsciiString CONNECTION = AsciiString.cached("Connection");
38      private static final AsciiString KEEP_ALIVE = AsciiString.cached("keep-alive");
39  
40      @Override
41      public void channelReadComplete(ChannelHandlerContext ctx) {
42          ctx.flush();
43      }
44  
45      @Override
46      public void channelRead0(ChannelHandlerContext ctx, HttpObject msg) {
47          if (msg instanceof HttpRequest) {
48              HttpRequest req = (HttpRequest) msg;
49  
50              boolean keepAlive = HttpUtil.isKeepAlive(req);
51              FullHttpResponse response = new DefaultFullHttpResponse(HTTP_1_1, OK, Unpooled.wrappedBuffer(CONTENT));
52              response.headers().set(CONTENT_TYPE, "text/plain");
53              response.headers().setInt(CONTENT_LENGTH, response.content().readableBytes());
54  
55              if (!keepAlive) {
56                  ctx.write(response).addListener(ChannelFutureListener.CLOSE);
57              } else {
58                  response.headers().set(CONNECTION, KEEP_ALIVE);
59                  ctx.write(response);
60              }
61          }
62      }
63  
64      @Override
65      public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) {
66          cause.printStackTrace();
67          ctx.close();
68      }
69  }