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Moxygen (Meta)

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Language: C++ (mvfst-based) Organization: Meta Maintainer: alan-frindell, Joseph Beshay GitHub: facebookexperimental/moxygen Relay endpoint: fb.mvfst.net

Overview

Meta’s open-source C++ MOQ implementation built on their mvfst QUIC library. Includes relay, client, and protocol library. OpenMOQ maintains a fork (openmoq/moxygen) as a buffer repo for their planned moqx server.

History

  • 2026-03-16: alan-frindell achieved 0-RTT subscribe with draft-16 + unidirectional control streams.
  • 2026-06-09/10: draft-18 relay live at the London hackathon — afrind brought the relay up at fb.mvfst.net:9448 (QUIC + WebTransport) supporting versions 14/16/18, the first publicly-announced draft-18 relay endpoint. Known gaps at launch: no REDIRECT errors, no GOAWAY-on-request-stream, no PUBLISH_BLOCKED. afrind also shipped a draft-18 wire decoder (moqx/tools/moq_decode.py, openmoq/moqx PR #398) to help debug interop failures.

Draft Support

  • Draft 14 and 16 supported
  • Can negotiate draft 15
  • qmux support on port 9449

Public Infrastructure

  • QUIC relay: moqt://fb.mvfst.net:9448 / https://fb.mvfst.net:9448/moq-relay
  • QMux relay: fb.mvfst.net:9449 (TLS/TCP and QUIC)
  • WebSocket proxy: wss://fb.mvfst.net:9450 (proxying to TLS on 9449)

Recent Highlights

Day-by-day PR/issue history lives in the wiki log; this section keeps only durable milestones.

  • Meta lands moxygen via an internal-diff (Phabricator) workflow — changes merge to main as direct commits, not GitHub PRs, so most GitHub PRs are mirrors that get closed unmerged even when the change actually ships. PR-based activity scans therefore understate real progress.
  • The active relay/stats/TLS development line runs through the moqx fork rather than the upstream tree — afrind’s relay/stats hardening and gmarzot’s PKCS#12 TLS work land there. See openmoq.
  • qlog + visualization tooling: per-connection QLogger wiring (HQServerTransportFactory::setQLoggerFactory) and an overhauled MoQ viz tool (NDJSON input, track-alias reconstruction, no CDN dependency).
  • Wire-conformance tightening: a zero DELIVERY_TIMEOUT is now a PROTOCOL_VIOLATION on draft ≤16 (the versions moxygen advertises).
  • draft-18 REQUEST_UPDATE / FORWARD work (mid-July 2026, direct commits): subscriber-side request_updates for SUBSCRIBE_TRACKS and SUBSCRIBE_NAMESPACE, Forward made updatable in REQUEST_UPDATE for SUBSCRIBE_TRACKS, and subgroup-reopen gated on v18 forward resume — the implementation side of the upstream FORWARD-on-REQUEST_UPDATE / INCLUDE_PROPERTIES cluster (ianswett’s moq-transport #1813). Breaks a weeks-long GitHub-visible quiet streak (consistent with the Phabricator-diff workflow above).

Interop

  • Frequently used as the “reference relay” for interop testing; see interop-endpoints for the full endpoint listing.

Related

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