---
id: ws-upgrade-session
name: WS upgrade route + channels session (server producer half)
status: pending
depends_on: [ws-byte-adapter, server-adapter]
scope: broad
risk: high
impact: phase
level: implementation
tags: [websocket, phase-2]
---

## Description

Implement the WS upgrade handler per ADR-067/websocket.md, production
shape: axum route at `/alk/channels`; bearer auth on the upgrade
request (401 without token); upgrade → adapt the WS stream with the
byte-adapter (ws-byte-adapter) → `Connection::from_bidi(ws_stream,
b"alk/channels")` → run the channels accept path: alkcall
`ChannelsAdapter` in-line demux with the `install_channel_zero` hook
constructing channel 0's `CallConnection` (identity attached) and
running `Dispatcher::run_loop_single_stream`. Text messages rejected
(WS close 1002). Overlay-only session construction mirrors the alknet
`upgrade.rs::run_ws_session` shape but through the channels machinery.

## Acceptance Criteria

- [ ] Upgrade route wired into HttpAdapter's router (reserved-path collision rule respected)
- [ ] End-to-end test: WS client (tokio-tungstenite or axum test client) → upgrade → chunk-framed call.requested on channel 0 → response received
- [ ] Browser-style test: services/list via channel 0, AccessControl-filtered
- [ ] Disconnect mid-call: pending requests failed, overlay dropped, no hang
- [ ] 16 MiB chunk split/reassembly test carried over from the POC
- [ ] `cargo test` passes

## References

- docs/architecture/websocket.md (full spec)
- docs/architecture/decisions/067-websocket-carries-channels.md
- alkcall `channels/client.rs` tests (make_install_channel_zero wiring pattern)
- Old source: `/workspace/@alkdev/alknet/crates/alknet-http/src/websocket/upgrade.rs` (session lifecycle; framing superseded)

## Notes

> Agent fills during implementation.

## Summary

> Agent fills on completion.