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1   /*
2    * Copyright 2014 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.spdy.server;
17  
18  import io.netty.buffer.ByteBuf;
19  import io.netty.buffer.Unpooled;
20  import io.netty.channel.ChannelFutureListener;
21  import io.netty.channel.ChannelHandlerContext;
22  import io.netty.channel.SimpleChannelInboundHandler;
23  import io.netty.handler.codec.http.DefaultFullHttpResponse;
24  import io.netty.handler.codec.http.FullHttpResponse;
25  import io.netty.handler.codec.http.HttpRequest;
26  import io.netty.util.CharsetUtil;
27  
28  import java.util.Date;
29  
30  import static io.netty.handler.codec.http.HttpHeaderNames.CONNECTION;
31  import static io.netty.handler.codec.http.HttpHeaderNames.CONTENT_LENGTH;
32  import static io.netty.handler.codec.http.HttpHeaderNames.CONTENT_TYPE;
33  import static io.netty.handler.codec.http.HttpHeaderValues.CLOSE;
34  import static io.netty.handler.codec.http.HttpHeaderValues.KEEP_ALIVE;
35  import static io.netty.handler.codec.http.HttpResponseStatus.CONTINUE;
36  import static io.netty.handler.codec.http.HttpResponseStatus.OK;
37  import static io.netty.handler.codec.http.HttpVersion.HTTP_1_0;
38  import static io.netty.handler.codec.http.HttpVersion.HTTP_1_1;
39  import static io.netty.handler.codec.http.HttpUtil.is100ContinueExpected;
40  import static io.netty.handler.codec.http.HttpUtil.isKeepAlive;
41  
42  /**
43   * HTTP handler that responds with a "Hello World"
44   */
45  public class SpdyServerHandler extends SimpleChannelInboundHandler<Object> {
46  
47      @Override
48      public void channelRead0(ChannelHandlerContext ctx, Object msg) throws Exception {
49          if (msg instanceof HttpRequest) {
50              HttpRequest req = (HttpRequest) msg;
51  
52              if (is100ContinueExpected(req)) {
53                  ctx.write(new DefaultFullHttpResponse(HTTP_1_1, CONTINUE, Unpooled.EMPTY_BUFFER));
54              }
55              boolean keepAlive = isKeepAlive(req);
56  
57              ByteBuf content = Unpooled.copiedBuffer("Hello World " + new Date(), CharsetUtil.UTF_8);
58  
59              FullHttpResponse response = new DefaultFullHttpResponse(HTTP_1_1, OK, content);
60              response.headers().set(CONTENT_TYPE, "text/plain; charset=UTF-8");
61              response.headers().setInt(CONTENT_LENGTH, response.content().readableBytes());
62  
63              if (keepAlive) {
64                  if (req.protocolVersion().equals(HTTP_1_0)) {
65                      response.headers().set(CONNECTION, KEEP_ALIVE);
66                  }
67                  ctx.write(response);
68              } else {
69                  // Tell the client we're going to close the connection.
70                  response.headers().set(CONNECTION, CLOSE);
71                  ctx.write(response).addListener(ChannelFutureListener.CLOSE);
72              }
73          }
74      }
75  
76      @Override
77      public void channelReadComplete(ChannelHandlerContext ctx) {
78          ctx.flush();
79      }
80  
81      @Override
82      public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) {
83          cause.printStackTrace();
84          ctx.close();
85      }
86  }