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diff --git a/src/org/apache/http/conn/ConnectionKeepAliveStrategy.java b/src/org/apache/http/conn/ConnectionKeepAliveStrategy.java
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+/*
+ * $HeadURL: $
+ * $Revision: $
+ * $Date: $
+ *
+ * ====================================================================
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you 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.conn;
+
+import org.apache.http.ConnectionReuseStrategy;
+import org.apache.http.HttpResponse;
+import org.apache.http.protocol.HttpContext;
+
+/**
+ * Interface for deciding how long a connection can remain
+ * idle before being reused.
+ *
+ * @author <a href="mailto:sberlin at gmail.com">Sam Berlin</a>
+ *
+ *
+ * @version $Revision: $
+ * 
+ * @since 4.0
+ */
+public interface ConnectionKeepAliveStrategy {
+    
+    /**
+     * Returns the duration of time which this connection can be safely kept
+     * idle. If the connection is left idle for longer than this period of time,
+     * it MUST not reused. A value of 0 or less may be returned to indicate that
+     * there is no suitable suggestion.
+     * 
+     * When coupled with a {@link ConnectionReuseStrategy}, if
+     * {@link ConnectionReuseStrategy#keepAlive(HttpResponse, HttpContext)
+     * returns true, this allows you to control how long the reuse will last. If
+     * keepAlive returns false, this should have no meaningful impact
+     * 
+     * @param response
+     *            The last response received over the connection.
+     * @param context
+     *            the context in which the connection is being used.
+     * 
+     * @return the duration in ms for which it is safe to keep the connection
+     *         idle, or <=0 if no suggested duration.
+     */
+    long getKeepAliveDuration(HttpResponse response, HttpContext context);
+    
+}