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diff --git a/src/org/apache/http/params/DefaultedHttpParams.java b/src/org/apache/http/params/DefaultedHttpParams.java
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+/*
+ * $HeadURL: http://svn.apache.org/repos/asf/httpcomponents/httpcore/trunk/module-main/src/main/java/org/apache/http/params/DefaultedHttpParams.java $
+ * $Revision: 610763 $
+ * $Date: 2008-01-10 04:01:13 -0800 (Thu, 10 Jan 2008) $
+ *
+ * ====================================================================
+ * 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.params;
+
+import org.apache.http.params.HttpParams;
+
+/**
+ * {@link HttpParams} implementation that delegates resolution of a parameter
+ * to the given default {@link HttpParams} instance if the parameter is not 
+ * present in the local one. The state of the local collection can be mutated,
+ * whereas the default collection is treated as read-only.
+ *
+ * @author <a href="mailto:oleg at ural.ru">Oleg Kalnichevski</a>
+ * 
+ * @version $Revision: 610763 $
+ */
+public final class DefaultedHttpParams extends AbstractHttpParams {
+
+    private final HttpParams local;
+    private final HttpParams defaults;
+    
+    public DefaultedHttpParams(final HttpParams local, final HttpParams defaults) {
+        super();
+        if (local == null) {
+            throw new IllegalArgumentException("HTTP parameters may not be null");
+        }
+        this.local = local;
+        this.defaults = defaults;
+    }
+
+    /**
+     * Creates a copy of the local collection with the same default
+     */
+    public HttpParams copy() {
+        HttpParams clone = this.local.copy();
+        return new DefaultedHttpParams(clone, this.defaults);
+    }
+
+    /**
+     * Retrieves the value of the parameter from the local collection and, if the 
+     * parameter is not set locally, delegates its resolution to the default 
+     * collection.
+     */
+    public Object getParameter(final String name) {
+        Object obj = this.local.getParameter(name);
+        if (obj == null && this.defaults != null) {
+            obj = this.defaults.getParameter(name);
+        }
+        return obj;
+    }
+
+    /**
+     * Attempts to remove the parameter from the local collection. This method 
+     * <i>does not</i> modify the default collection.
+     */
+    public boolean removeParameter(final String name) {
+        return this.local.removeParameter(name);
+    }
+
+    /**
+     * Sets the parameter in the local collection. This method <i>does not</i> 
+     * modify the default collection.
+     */
+    public HttpParams setParameter(final String name, final Object value) {
+        return this.local.setParameter(name, value);
+    }
+
+    public HttpParams getDefaults() {
+        return this.defaults;
+    }
+    
+}