01: /*
02: * $HeadURL: https://svn.apache.org/repos/asf/httpcomponents/httpcore/tags/4.0-beta1/module-main/src/main/java/org/apache/http/protocol/ResponseServer.java $
03: * $Revision: 576073 $
04: * $Date: 2007-09-16 12:53:13 +0200 (Sun, 16 Sep 2007) $
05: *
06: * ====================================================================
07: * Licensed to the Apache Software Foundation (ASF) under one
08: * or more contributor license agreements. See the NOTICE file
09: * 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:
53: public ResponseServer() {
54: super ();
55: }
56:
57: public void process(final HttpResponse response,
58: final HttpContext context) throws HttpException,
59: IOException {
60: if (response == null) {
61: throw new IllegalArgumentException(
62: "HTTP request may not be null");
63: }
64: if (!response.containsHeader(HTTP.SERVER_HEADER)) {
65: String s = (String) response.getParams().getParameter(
66: CoreProtocolPNames.ORIGIN_SERVER);
67: if (s != null) {
68: response.addHeader(HTTP.SERVER_HEADER, s);
69: }
70: }
71: }
72:
73: }
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