global

def stream_response(&block)
  size = 0
  yielded = false
  block_result = block.call do |chunk|
    if chunk.bytesize.positive? || size.positive?
      yielded = true
      size += chunk.bytesize
      request.on_data.call(chunk, size, self)
    end
  end
  request.on_data.call(+'', 0, self) unless yielded
  block_result
end