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diff --git a/src/org/apache/http/message/AbstractHttpMessage.java b/src/org/apache/http/message/AbstractHttpMessage.java
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+++ b/src/org/apache/http/message/AbstractHttpMessage.java
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+/*
+ * $HeadURL: http://svn.apache.org/repos/asf/httpcomponents/httpcore/trunk/module-main/src/main/java/org/apache/http/message/AbstractHttpMessage.java $
+ * $Revision: 620287 $
+ * $Date: 2008-02-10 07:15:53 -0800 (Sun, 10 Feb 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.message;
+
+import java.util.Iterator;
+
+import org.apache.http.Header;
+import org.apache.http.HeaderIterator;
+import org.apache.http.HttpMessage;
+import org.apache.http.params.HttpParams;
+import org.apache.http.params.BasicHttpParams;
+
+/**
+ * Basic implementation of an HTTP message that can be modified.
+ *
+ * @author <a href="mailto:oleg at ural.ru">Oleg Kalnichevski</a>
+ *
+ * @version $Revision: 620287 $
+ * 
+ * @since 4.0
+ */
+public abstract class AbstractHttpMessage implements HttpMessage {
+    
+    protected HeaderGroup headergroup;
+    
+    protected HttpParams params;
+    
+    protected AbstractHttpMessage(final HttpParams params) {
+        super();
+        this.headergroup = new HeaderGroup();
+        this.params = params;
+    }
+
+    protected AbstractHttpMessage() {
+        this(null);
+    }
+
+    // non-javadoc, see interface HttpMessage
+    public boolean containsHeader(String name) {
+        return this.headergroup.containsHeader(name);
+    }
+    
+    // non-javadoc, see interface HttpMessage
+    public Header[] getHeaders(final String name) {
+        return this.headergroup.getHeaders(name);
+    }
+
+    // non-javadoc, see interface HttpMessage
+    public Header getFirstHeader(final String name) {
+        return this.headergroup.getFirstHeader(name);
+    }
+
+    // non-javadoc, see interface HttpMessage
+    public Header getLastHeader(final String name) {
+        return this.headergroup.getLastHeader(name);
+    }
+
+    // non-javadoc, see interface HttpMessage
+    public Header[] getAllHeaders() {
+        return this.headergroup.getAllHeaders();
+    }
+    
+    // non-javadoc, see interface HttpMessage
+    public void addHeader(final Header header) {
+        this.headergroup.addHeader(header);
+    }
+
+    // non-javadoc, see interface HttpMessage
+    public void addHeader(final String name, final String value) {
+        if (name == null) {
+            throw new IllegalArgumentException("Header name may not be null");
+        }
+        this.headergroup.addHeader(new BasicHeader(name, value));
+    }
+
+    // non-javadoc, see interface HttpMessage
+    public void setHeader(final Header header) {
+        this.headergroup.updateHeader(header);
+    }
+
+    // non-javadoc, see interface HttpMessage
+    public void setHeader(final String name, final String value) {
+        if (name == null) {
+            throw new IllegalArgumentException("Header name may not be null");
+        }
+        this.headergroup.updateHeader(new BasicHeader(name, value));
+    }
+
+    // non-javadoc, see interface HttpMessage
+    public void setHeaders(final Header[] headers) {
+        this.headergroup.setHeaders(headers);
+    }
+
+    // non-javadoc, see interface HttpMessage
+    public void removeHeader(final Header header) {
+        this.headergroup.removeHeader(header);
+    }
+    
+    // non-javadoc, see interface HttpMessage
+    public void removeHeaders(final String name) {
+        if (name == null) {
+            return;
+        }
+        for (Iterator i = this.headergroup.iterator(); i.hasNext(); ) {
+            Header header = (Header) i.next();
+            if (name.equalsIgnoreCase(header.getName())) {
+                i.remove();
+            }
+        }
+    }
+    
+    // non-javadoc, see interface HttpMessage
+    public HeaderIterator headerIterator() {
+        return this.headergroup.iterator();
+    }
+
+    // non-javadoc, see interface HttpMessage
+    public HeaderIterator headerIterator(String name) {
+        return this.headergroup.iterator(name);
+    }
+    
+    // non-javadoc, see interface HttpMessage
+    public HttpParams getParams() {
+        if (this.params == null) {
+            this.params = new BasicHttpParams();
+        }
+        return this.params;
+    }
+    
+    // non-javadoc, see interface HttpMessage
+    public void setParams(final HttpParams params) {
+        if (params == null) {
+            throw new IllegalArgumentException("HTTP parameters may not be null");
+        }
+        this.params = params;
+    }
+}