[quicwg/base-drafts] Consistent presenting Connection ID in packet or frame (#1336)

[Quoc-Viet Nguyen <[e-mail]>]

Currently, there are 4 ways a Connection ID (CID) is presented in a packet or frame:

1. Using DCIL and SCIL (both 4-bit) in Long Header to encode its length.
2. No CID length in Short Header.
3. Fixed size CID in Stateless Reset packet.
4. Using a 8-bit field in NEW_CONNECTION_ID Frame for its length.

I am wondering if it is possible to unify the way a CID is presented like Stream ID. I understand that CID is version-independent but what I am concerned the most is CID in Short Header:

> Endpoints using a connection-ID based load balancer could agree with the load balancer on a fixed or minimum length and on an encoding for connection IDs. This fixed portion could encode an explicit length, which allows the entire connection ID to vary in length and still be used by the load balancer.

I'm trying to implement a QUIC proxy and I don't know how to do with that since I don't control backend applications. Can we specify a Connection ID encoding in the specification, or at least in the first version?

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