class Excon::Middleware::Expects

def response_call(datum)
  if datum.has_key?(:expects) && ![*datum[:expects]].include?(datum[:response][:status])
    raise(
      Excon::Errors.status_error(
        datum.reject {|key,value| key == :response},
        Excon::Response.new(datum[:response])
      )
    )
  else
    @stack.response_call(datum)
  end
end