The datatracker says:*This Internet-Draft is no longer active. A copy of the expired Internet-Draft can be found at:* https://www.ietf.org/archive/id/draft-ietf-quic-ack-frequency-01.txt <https://www.ietf.org/archive/id/draft-ietf-quic-ack-frequency-01.txt>
-- Christian Huitema
