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Outside-boundary matrices

Reviewed on: 2026-03-28

These tables list surfaces that are intentionally outside tigrcorn's current T/P/A/D/R product boundary.

Legend:

  • C-RFC — tigrcorn implements the surface and includes it in the current certified RFC boundary.
  • C-OP — tigrcorn implements the surface and includes it in the current certified public/operator surface.
  • S — current official docs show first-class public support.
  • Cfg — current official docs show public support through a primary config surface rather than a dedicated CLI switch.
  • P — partial, optional, qualified, or draft support.
  • M — middleware/wrapper based support instead of a first-class server surface.
  • O — intentionally outside tigrcorn's current product boundary.
  • — — no current official public support claim found in the reviewed primary docs.

Outside-boundary RFC targets

Surface Tigrcorn Uvicorn Hypercorn Granian Notes
RFC 9218 Extensible Priorities O — — — Outside the tigrcorn boundary; Hypercorn's docs mention HTTP/2 prioritisation but not RFC 9218.
RFC 9111 HTTP caching/freshness O — — — Outside tigrcorn's direct origin/runtime boundary.
RFC 9530 Digest Fields O — — — Outside tigrcorn's current boundary.
RFC 9421 HTTP Message Signatures O — — — Outside tigrcorn's current boundary.
RFC 7515 / RFC 7516 / RFC 7519 JOSE stack O — — — Non-core product layer for this repository.
RFC 8152 / RFC 9052 COSE stack O — — — Non-core product layer for this repository.

Outside-boundary CLI feature families

Surface Tigrcorn Uvicorn Hypercorn Granian Notes
HTTP parser/backend selector O S — — Uvicorn exposes `--http auto
WebSocket engine selector O S — — Uvicorn exposes --ws ...; tigrcorn intentionally does not.
Alternate interface selector (ASGI2/WSGI/RSGI) O S S S tigrcorn stays ASGI3-only; peers expose broader interface selection.
Trio runtime / worker selection O — S — Hypercorn documents trio workers; tigrcorn keeps Trio out of bounds.
Runtime topology / task-engine selector O — — S Granian exposes runtime mode and task implementation knobs.
TLS protocol-min downgrade selector O S — S Uvicorn exposes --ssl-version; Granian exposes --ssl-protocol-min; tigrcorn keeps downgrade policy out of bounds.

Outside-boundary public operator surfaces

Surface Tigrcorn Uvicorn Hypercorn Granian Notes
Parser pluggability as public product surface O S — — Uvicorn publicly selects HTTP parsers; tigrcorn keeps parser pluggability out of bounds.
WebSocket engine pluggability O S — — Uvicorn publicly selects WebSocket engines; tigrcorn keeps this out of bounds.
ASGI2 / WSGI / RSGI hosting families O S S S tigrcorn stays ASGI3-only by policy.
Trio runtime family O — S — Hypercorn documents trio workers; tigrcorn excludes Trio.
Runtime thread-topology / task-engine family O — — S Granian exposes runtime mode and task implementation; tigrcorn excludes this family.
Gateway-style caching / integrity / signature behavior O — — — tigrcorn keeps cache/integrity/signature gateways out of product scope.

Boundary policy sources:

  • docs/review/conformance/CERTIFICATION_BOUNDARY.md
  • docs/review/conformance/BOUNDARY_NON_GOALS.md
  • docs/review/conformance/NEXT_DEVELOPMENT_TARGETS.md