001/*
002 * ====================================================================
003 * Licensed to the Apache Software Foundation (ASF) under one
004 * or more contributor license agreements.  See the NOTICE file
005 * distributed with this work for additional information
006 * regarding copyright ownership.  The ASF licenses this file
007 * to you under the Apache License, Version 2.0 (the
008 * "License"); you may not use this file except in compliance
009 * with the License.  You may obtain a copy of the License at
010 *
011 *   http://www.apache.org/licenses/LICENSE-2.0
012 *
013 * Unless required by applicable law or agreed to in writing,
014 * software distributed under the License is distributed on an
015 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
016 * KIND, either express or implied.  See the License for the
017 * specific language governing permissions and limitations
018 * under the License.
019 * ====================================================================
020 *
021 * This software consists of voluntary contributions made by many
022 * individuals on behalf of the Apache Software Foundation.  For more
023 * information on the Apache Software Foundation, please see
024 * <http://www.apache.org/>.
025 *
026 */
027
028package org.apache.http.impl.client;
029
030import org.apache.http.Header;
031import org.apache.http.HttpHeaders;
032import org.apache.http.HttpRequest;
033import org.apache.http.HttpResponse;
034import org.apache.http.TokenIterator;
035import org.apache.http.impl.DefaultConnectionReuseStrategy;
036import org.apache.http.message.BasicHeaderIterator;
037import org.apache.http.message.BasicTokenIterator;
038import org.apache.http.protocol.HTTP;
039import org.apache.http.protocol.HttpContext;
040import org.apache.http.protocol.HttpCoreContext;
041
042public class DefaultClientConnectionReuseStrategy extends DefaultConnectionReuseStrategy {
043
044    public static final DefaultClientConnectionReuseStrategy INSTANCE = new DefaultClientConnectionReuseStrategy();
045
046    @Override
047    public boolean keepAlive(final HttpResponse response, final HttpContext context) {
048
049        final HttpRequest request = (HttpRequest) context.getAttribute(HttpCoreContext.HTTP_REQUEST);
050        if (request != null) {
051            final Header[] connHeaders = request.getHeaders(HttpHeaders.CONNECTION);
052            if (connHeaders.length != 0) {
053                final TokenIterator ti = new BasicTokenIterator(new BasicHeaderIterator(connHeaders, null));
054                while (ti.hasNext()) {
055                    final String token = ti.nextToken();
056                    if (HTTP.CONN_CLOSE.equalsIgnoreCase(token)) {
057                        return false;
058                    }
059                }
060            }
061        }
062        return super.keepAlive(response, context);
063    }
064
065}