Compatible Version Negotiation for QUIC
D. Schinazi, Eric Rescorla · 2023
QUIC does not provide a complete version negotiation mechanism but instead only provides a way for the server to indicate that the version the client offered is unacceptable. This document describes a version negotiation mechanism that allows a client and server to select from a set of QUIC versions which share a compatible Initial format without incurring an extra round trip.