konradandCursor
2c621d4b7f
The default stays v2. A reflector that refuses that version and names the other gets one session of it, then the station announces the configured protocol again. Co-authored-by: Cursor <cursoragent@cursor.com>
6 lines
1.0 KiB
Markdown
6 lines
1.0 KiB
Markdown
Superseded by [ADR 0006](0006-configured-protocol.md).
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# Announce protocol 3.0, fall back only on an explicit 2.x maximum
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Every TCP connection announces protocol 3.0. The station opens one 2.0 session only when the reflector sends a downgrade, or an unsupported-version error, whose maximum is at least 2.0 and below 3.0. The connection after that 2.0 session ends announces 3.0 again. A maximum whose major is below 2 stops the station with the reflector’s message. A reflector `MsgError` stops the station until the operator quits. A bad CA signature, a TLS or hostname failure, a heartbeat timeout, and a dropped connection retry on 3.0, and the window keeps the reason between attempts. The Protocol line shows 2.0 or 3.0 while the session is up, so a plaintext session is visible. Staying on 3.0 after every failure was rejected because a reflector that still expects 2.0 would never accept the station. Falling back on any handshake failure was rejected because a TLS or CA problem would then send plaintext audio.
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