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diff --git a/src/org/apache/http/impl/io/ChunkedOutputStream.java b/src/org/apache/http/impl/io/ChunkedOutputStream.java
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+++ b/src/org/apache/http/impl/io/ChunkedOutputStream.java
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+/*
+ * $HeadURL: http://svn.apache.org/repos/asf/httpcomponents/httpcore/trunk/module-main/src/main/java/org/apache/http/impl/io/ChunkedOutputStream.java $
+ * $Revision: 645081 $
+ * $Date: 2008-04-05 04:36:42 -0700 (Sat, 05 Apr 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.impl.io;
+
+import java.io.IOException;
+import java.io.OutputStream;
+
+import org.apache.http.io.SessionOutputBuffer;
+
+/**
+ * Implements chunked transfer coding.
+ * See <a href="http://www.w3.org/Protocols/rfc2616/rfc2616.txt">RFC 2616</a>,
+ * <a href="http://www.w3.org/Protocols/rfc2616/rfc2616-sec3.html#sec3.6">section 3.6.1</a>.
+ * Writes are buffered to an internal buffer (2048 default size).
+ * 
+ * @author Mohammad Rezaei (Goldman, Sachs &amp; Co.)
+ * @author <a href="mailto:oleg at ural.ru">Oleg Kalnichevski</a>
+ * 
+ * @since 4.0
+ */
+public class ChunkedOutputStream extends OutputStream {
+
+    // ----------------------------------------------------- Instance Variables
+    private final SessionOutputBuffer out;
+
+    private byte[] cache;
+
+    private int cachePosition = 0;
+
+    private boolean wroteLastChunk = false;
+
+    /** True if the stream is closed. */
+    private boolean closed = false;
+    
+    // ----------------------------------------------------------- Constructors
+    /**
+     * Wraps a session output buffer and chunks the output.
+     * @param out the session output buffer to wrap
+     * @param bufferSize minimum chunk size (excluding last chunk)
+     * @throws IOException
+     */
+    public ChunkedOutputStream(final SessionOutputBuffer out, int bufferSize)
+            throws IOException {
+        super();
+        this.cache = new byte[bufferSize];
+        this.out = out;
+    }
+
+    /**
+     * Wraps a session output buffer and chunks the output. The default buffer 
+     * size of 2048 was chosen because the chunk overhead is less than 0.5%
+     *
+     * @param out       the output buffer to wrap
+     * @throws IOException
+     */
+    public ChunkedOutputStream(final SessionOutputBuffer out) 
+            throws IOException {
+        this(out, 2048);
+    }
+
+    // ----------------------------------------------------------- Internal methods
+    /**
+     * Writes the cache out onto the underlying stream
+     * @throws IOException
+     */
+    protected void flushCache() throws IOException {
+        if (this.cachePosition > 0) {
+            this.out.writeLine(Integer.toHexString(this.cachePosition));
+            this.out.write(this.cache, 0, this.cachePosition);
+            this.out.writeLine("");
+            this.cachePosition = 0;
+        }
+    }
+
+    /**
+     * Writes the cache and bufferToAppend to the underlying stream
+     * as one large chunk
+     * @param bufferToAppend
+     * @param off
+     * @param len
+     * @throws IOException
+     */
+    protected void flushCacheWithAppend(byte bufferToAppend[], int off, int len) throws IOException {
+        this.out.writeLine(Integer.toHexString(this.cachePosition + len));
+        this.out.write(this.cache, 0, this.cachePosition);
+        this.out.write(bufferToAppend, off, len);
+        this.out.writeLine("");
+        this.cachePosition = 0;
+    }
+
+    protected void writeClosingChunk() throws IOException {
+        // Write the final chunk.
+        this.out.writeLine("0");
+        this.out.writeLine("");
+    }
+
+    // ----------------------------------------------------------- Public Methods
+    /**
+     * Must be called to ensure the internal cache is flushed and the closing chunk is written.
+     * @throws IOException
+     */
+    public void finish() throws IOException {
+        if (!this.wroteLastChunk) {
+            flushCache();
+            writeClosingChunk();
+            this.wroteLastChunk = true;
+        }
+    }
+
+    // -------------------------------------------- OutputStream Methods
+    public void write(int b) throws IOException {
+        if (this.closed) {
+            throw new IOException("Attempted write to closed stream.");
+        }
+        this.cache[this.cachePosition] = (byte) b;
+        this.cachePosition++;
+        if (this.cachePosition == this.cache.length) flushCache();
+    }
+
+    /**
+     * Writes the array. If the array does not fit within the buffer, it is
+     * not split, but rather written out as one large chunk.
+     * @param b
+     * @throws IOException
+     */
+    public void write(byte b[]) throws IOException {
+        write(b, 0, b.length);
+    }
+
+    public void write(byte src[], int off, int len) throws IOException {
+        if (this.closed) {
+            throw new IOException("Attempted write to closed stream.");
+        }
+        if (len >= this.cache.length - this.cachePosition) {
+            flushCacheWithAppend(src, off, len);
+        } else {
+            System.arraycopy(src, off, cache, this.cachePosition, len);
+            this.cachePosition += len;
+        }
+    }
+
+    /**
+     * Flushes the content buffer and the underlying stream.
+     * @throws IOException
+     */
+    public void flush() throws IOException {
+        flushCache();
+        this.out.flush();
+    }
+
+    /**
+     * Finishes writing to the underlying stream, but does NOT close the underlying stream.
+     * @throws IOException
+     */
+    public void close() throws IOException {
+        if (!this.closed) {
+            this.closed = true;
+            finish();
+            this.out.flush();
+        }
+    }
+}