class Excon::Connection

def response_call(datum)
  # ensure response_block is yielded to and body is empty from middlewares
  if datum.has_key?(:response_block) && !(datum[:response][:body].nil? || datum[:response][:body].empty?)
    response_body = datum[:response][:body].dup
    datum[:response][:body] = ''
    content_length = remaining = response_body.bytesize
    while remaining > 0
      datum[:response_block].call(response_body.slice!(0, [datum[:chunk_size], remaining].min), [remaining - datum[:chunk_size], 0].max, content_length)
      remaining -= datum[:chunk_size]
    end
  end
  datum
end