/*
* $HeadURL: https://svn.apache.org/repos/asf/jakarta/httpcomponents/httpcore/tags/4.0-alpha2/src/java/org/apache/http/impl/DefaultConnectionReuseStrategy.java $
* $Revision: 376961 $
* $Date: 2006-02-11 11:32:50 +0100 (Sat, 11 Feb 2006) $
*
* ====================================================================
*
* Copyright 1999-2006 The Apache Software Foundation
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
* ====================================================================
*
* This software consists of voluntary contributions made by many
* individuals on behalf of the Apache Software Foundation. For more
* information on the Apache Software Foundation, please see
* <http://www.apache.org/>.
*
*/
package org.apache.http.impl;
import org.apache.http.ConnectionReuseStrategy;
import org.apache.http.Header;
import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.HttpVersion;
import org.apache.http.protocol.HTTP;
/**
* Default implementation of a strategy deciding about connection re-use.
*
* @author <a href="mailto:oleg at ural.ru">Oleg Kalnichevski</a>
*
* @version $Revision: 376961 $
*
* @since 4.0
*/
public class DefaultConnectionReuseStrategy implements ConnectionReuseStrategy {
public DefaultConnectionReuseStrategy() {
super();
}
public boolean keepAlive(final HttpResponse response) {
if (response == null) {
throw new IllegalArgumentException("HTTP response may not be null");
}
HttpEntity entity = response.getEntity();
HttpVersion ver = response.getStatusLine().getHttpVersion();
if (entity != null) {
if (entity.getContentLength() < 0) {
if (!entity.isChunked() || ver.lessEquals(HttpVersion.HTTP_1_0)) {
// if the content length is not known and is not chunk
// encoded, the connection cannot be reused
return false;
}
}
}
// Check for 'Connection' directive
Header connheader = response.getFirstHeader(HTTP.CONN_DIRECTIVE);
if (connheader != null) {
String conndirective = connheader.getValue();
if (HTTP.CONN_CLOSE.equalsIgnoreCase(conndirective)) {
return false;
} else if (HTTP.CONN_KEEP_ALIVE.equalsIgnoreCase(conndirective)) {
return true;
} else {
// log unknown directive
}
}
// Resorting to protocol version default close connection policy
return ver.greaterEquals(HttpVersion.HTTP_1_1);
}
}