class HTTP::Response::Streamer

def readpartial(size = nil, outbuf = nil)
  unless size
    if defined?(HTTP::Client::BUFFER_SIZE)
      size = HTTP::Client::BUFFER_SIZE
    elsif defined?(HTTP::Connection::BUFFER_SIZE)
      size = HTTP::Connection::BUFFER_SIZE
    end
  end
  chunk = @io.read size, outbuf
  chunk.force_encoding(@encoding) if chunk
end