The IETF HAPPY WG (Heuristics and Algorithms to Prioritize Protocol deploYment) 
was formally announced on 12 February 2025.

The broad remit of the WG is to define an updated version of the Happy Eyeballs 
v2 algorithm, taking into account new protocols and client and server 
deployments that have happened in the past 8 years.

Such considerations include use of QUIC, Service Binding DNS records (SVCB and 
HTTPS RRs), TLS encrypted client hello, and increased use of IPv6-only and 
IPv6-Mostly networks.

The 90-minute WG session on Tuesday afternoon at IETF122 in Bangkok will be 
focused on discussion of the existing HEv3 draft: 
https://datatracker.ietf.org/doc/draft-pauly-happy-happyeyeballs-v3/. We 
encourage attendees to read this draft in advance of the meeting.

The WG session will also include input from implementors. We would very much 
welcome participation at the meeting or on the list from anyone with HE 
implementations or with data on HE operational behavior that may help shape the 
new version beneficially.

We aim to adopt the HEv3 draft at IETF122 subject to mailing list confirmation 
and progress the draft to the IESG for publication by around the time of the 
Vienna summer 2026 IETF meeting.

For more information about the WG see 
https://datatracker.ietf.org/wg/happy/about/.

Thanks,
Tim and Eric

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