RequestConnControl.java revision 069490a5ca2fd1988d29daf45d892f47ad665115 
1/*
2 * $HeadURL: http://svn.apache.org/repos/asf/httpcomponents/httpcore/trunk/module-main/src/main/java/org/apache/http/protocol/RequestConnControl.java $
3 * $Revision: 496070 $
4 * $Date: 2007-01-14 04:18:34 -0800 (Sun, 14 Jan 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
32package org.apache.http.protocol;
33
34import java.io.IOException;
35
36import org.apache.http.HttpException;
37import org.apache.http.HttpRequest;
38import org.apache.http.HttpRequestInterceptor;
39
40/**
41 * A request interceptor that suggests connection keep-alive to the server.
42 *
43 * @author <a href="mailto:oleg at ural.ru">Oleg Kalnichevski</a>
44 *
45 * @version $Revision: 496070 $
46 *
47 * @since 4.0
48 */
49public class RequestConnControl implements HttpRequestInterceptor {
50
51    public RequestConnControl() {
52        super();
53    }
54
55    public void process(final HttpRequest request, final HttpContext context)
56            throws HttpException, IOException {
57        if (request == null) {
58            throw new IllegalArgumentException("HTTP request may not be null");
59        }
60        if (!request.containsHeader(HTTP.CONN_DIRECTIVE)) {
61            // Default policy is to keep connection alive
62            // whenever possible
63            request.addHeader(HTTP.CONN_DIRECTIVE, HTTP.CONN_KEEP_ALIVE);
64        }
65    }
66
67}
68