public int doWrite(ByteChunk chunk,
    Response unused) throws IOException
Write some bytes.

 public long end() throws IOException
End the current request. It is acceptable to write extra bytes using
buffer.doWrite during the execution of this method.

 public ByteChunk getEncodingName()
Get the name of the encoding handled by this filter.

 public  void recycle()
Make the filter ready to process the next request.

 public  void setBuffer(OutputBuffer buffer)
Set the next buffer in the filter pipeline.

 public  void setResponse(Response response)
Some filters need additional parameters from the response. All the
necessary reading can occur in that method, as this method is called
after the response header processing is complete.