class WEBrick::HTTPResponse::ChunkedWrapper

def <<(*buf)
  write(buf)
  self
end

def initialize(socket, resp)
  @socket = socket
  @resp = resp
end

def write(buf)
  return 0 if buf.empty?
  socket = @socket
  @resp.instance_eval {
    size = buf.bytesize
    data = +"#{size.to_s(16)}#{CRLF}#{buf}#{CRLF}"
    socket.write(data)
    data.clear
    @sent_size += size
    size
  }
end