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1   /*
2    * ====================================================================
3    * Licensed to the Apache Software Foundation (ASF) under one
4    * or more contributor license agreements.  See the NOTICE file
5    * distributed with this work for additional information
6    * regarding copyright ownership.  The ASF licenses this file
7    * to you under the Apache License, Version 2.0 (the
8    * "License"); you may not use this file except in compliance
9    * with the License.  You may obtain a copy of the License at
10   *
11   *   http://www.apache.org/licenses/LICENSE-2.0
12   *
13   * Unless required by applicable law or agreed to in writing,
14   * software distributed under the License is distributed on an
15   * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
16   * KIND, either express or implied.  See the License for the
17   * specific language governing permissions and limitations
18   * under the License.
19   * ====================================================================
20   *
21   * This software consists of voluntary contributions made by many
22   * individuals on behalf of the Apache Software Foundation.  For more
23   * information on the Apache Software Foundation, please see
24   * <http://www.apache.org/>.
25   *
26   */
27  
28  package org.apache.http.impl.client;
29  
30  import org.apache.http.Header;
31  import org.apache.http.HttpHeaders;
32  import org.apache.http.HttpRequest;
33  import org.apache.http.HttpResponse;
34  import org.apache.http.TokenIterator;
35  import org.apache.http.impl.DefaultConnectionReuseStrategy;
36  import org.apache.http.message.BasicHeaderIterator;
37  import org.apache.http.message.BasicTokenIterator;
38  import org.apache.http.protocol.HTTP;
39  import org.apache.http.protocol.HttpContext;
40  import org.apache.http.protocol.HttpCoreContext;
41  
42  public class DefaultClientConnectionReuseStrategy extends DefaultConnectionReuseStrategy {
43  
44      public static final DefaultClientConnectionReuseStrategy INSTANCE = new DefaultClientConnectionReuseStrategy();
45  
46      @Override
47      public boolean keepAlive(final HttpResponse response, final HttpContext context) {
48  
49          final HttpRequest request = (HttpRequest) context.getAttribute(HttpCoreContext.HTTP_REQUEST);
50          if (request != null) {
51              final Header[] connHeaders = request.getHeaders(HttpHeaders.CONNECTION);
52              if (connHeaders.length != 0) {
53                  final TokenIterator ti = new BasicTokenIterator(new BasicHeaderIterator(connHeaders, null));
54                  while (ti.hasNext()) {
55                      final String token = ti.nextToken();
56                      if (HTTP.CONN_CLOSE.equalsIgnoreCase(token)) {
57                          return false;
58                      }
59                  }
60              }
61          }
62          return super.keepAlive(response, context);
63      }
64  
65  }