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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.http2.server;
17  
18  import io.netty.buffer.ByteBuf;
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.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   * HTTP handler that responds with a "Hello World"
34   */
35  public class HelloWorldHttp1Handler extends SimpleChannelInboundHandler<HttpRequest> {
36  
37      @Override
38      public void messageReceived(ChannelHandlerContext ctx, HttpRequest req) throws Exception {
39          if (HttpHeaderUtil.is100ContinueExpected(req)) {
40              ctx.write(new DefaultFullHttpResponse(HTTP_1_1, CONTINUE));
41          }
42          boolean keepAlive = HttpHeaderUtil.isKeepAlive(req);
43  
44          ByteBuf content = ctx.alloc().buffer();
45          content.writeBytes(HelloWorldHttp2Handler.RESPONSE_BYTES.duplicate());
46  
47          FullHttpResponse response = new DefaultFullHttpResponse(HTTP_1_1, OK, content);
48          response.headers().set(CONTENT_TYPE, "text/plain; charset=UTF-8");
49          response.headers().setInt(CONTENT_LENGTH, response.content().readableBytes());
50  
51          if (!keepAlive) {
52              ctx.writeAndFlush(response).addListener(ChannelFutureListener.CLOSE);
53          } else {
54              response.headers().set(CONNECTION, HttpHeaderValues.KEEP_ALIVE);
55              ctx.writeAndFlush(response);
56          }
57      }
58  
59      @Override
60      public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) {
61          cause.printStackTrace();
62          ctx.close();
63      }
64  }