class Excon::Middleware::Idempotent

def error_call(datum)
  if datum[:idempotent]
    if datum.has_key?(:request_block)
      Excon.display_warning('Excon requests with a :request_block can not be :idempotent.')
      datum[:idempotent] = false
    end
    if datum.has_key?(:pipeline)
      Excon.display_warning("Excon requests can not be :idempotent when pipelining.")
      datum[:idempotent] = false
    end
  end
  if datum[:idempotent] && [Excon::Errors::Timeout, Excon::Errors::SocketError,
      Excon::Errors::HTTPStatusError].any? {|ex| datum[:error].kind_of?(ex) } && datum[:retries_remaining] > 1
    # reduces remaining retries, reset connection, and restart request_call
    datum[:retries_remaining] -= 1
    connection = datum.delete(:connection)
    datum.reject! {|key, _| !Excon::VALID_REQUEST_KEYS.include?(key) }
    connection.request(datum)
  else
    @stack.error_call(datum)
  end
end