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1  /*
2   * $HeadURL: http://svn.apache.org/repos/asf/httpcomponents/httpcore/trunk/module-main/src/main/java/org/apache/http/protocol/ResponseServer.java $
3   * $Revision: 576073 $
4   * $Date: 2007-09-16 03:53:13 -0700 (Sun, 16 Sep 2007) $
5   *
6   * ====================================================================
7   * Licensed to the Apache Software Foundation (ASF) under one
8   * or more contributor license agreements.  See the NOTICE file
9   * distributed with this work for additional information
10   * regarding copyright ownership.  The ASF licenses this file
11   * to you under the Apache License, Version 2.0 (the
12   * "License"); you may not use this file except in compliance
13   * with the License.  You may obtain a copy of the License at
14   *
15   *   http://www.apache.org/licenses/LICENSE-2.0
16   *
17   * Unless required by applicable law or agreed to in writing,
18   * software distributed under the License is distributed on an
19   * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
20   * KIND, either express or implied.  See the License for the
21   * specific language governing permissions and limitations
22   * under the License.
23   * ====================================================================
24   *
25   * This software consists of voluntary contributions made by many
26   * individuals on behalf of the Apache Software Foundation.  For more
27   * information on the Apache Software Foundation, please see
28   * <http://www.apache.org/>.
29   *
30   */
31  
32  package org.apache.http.protocol;
33  
34  import java.io.IOException;
35  
36  import org.apache.http.HttpException;
37  import org.apache.http.HttpResponse;
38  import org.apache.http.HttpResponseInterceptor;
39  import org.apache.http.params.CoreProtocolPNames;
40  
41  /**
42   * A response interceptor that adds a Server header.
43   * For use on the server side.
44   *
45   * @author <a href="mailto:oleg at ural.ru">Oleg Kalnichevski</a>
46   *
47   * @version $Revision: 576073 $
48   *
49   * @since 4.0
50   */
51  public class ResponseServer implements HttpResponseInterceptor {
52  
ResponseServer()53      public ResponseServer() {
54          super();
55      }
56  
process(final HttpResponse response, final HttpContext context)57      public void process(final HttpResponse response, final HttpContext context)
58              throws HttpException, IOException {
59          if (response == null) {
60              throw new IllegalArgumentException("HTTP request may not be null");
61          }
62          if (!response.containsHeader(HTTP.SERVER_HEADER)) {
63              String s = (String) response.getParams().getParameter(
64                      CoreProtocolPNames.ORIGIN_SERVER);
65              if (s != null) {
66                  response.addHeader(HTTP.SERVER_HEADER, s);
67              }
68          }
69      }
70  
71  }
72