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Pamela ChiaandAleksi Immonen 35531ea2f4 feat(www): serve openapi spec at /openapi.json (#49587)
Agent-readiness scanners and agent fetchers look for an OpenAPI spec at
conventional same-origin paths, but the Management API spec is only
served on api.supabase.com and linked from the /.well-known/api-catalog
linkset, which scanners do not read. I added a rewrite so
supabase.com/openapi.json proxies the spec from its source of truth at
api.supabase.com/api/v1-json, using the same fall-through proxy
mechanism as /humans.txt and /evals.

**Note:** no cache or CORS headers on purpose: no consumer needs them
today, and the upstream response's set-cookie header defeats edge
caching regardless. I rejected a checked-in copy of the spec in favor of
proxying live (staleness). The /.well-known/api-catalog linkset already
points at the spec (PR #44880) and is untouched here; this PR only adds
the conventional same-origin path.

**Merge order:** merge only after supabase/platform#37571 deploys. The
spec currently ships `servers: []`, so OpenAPI consumers resolve
relative paths against the fetch origin; without the platform fix this
proxy would point spec-compliant clients at supabase.com/v1/*.

## To test
Tested on Vercel preview:
- [x] `curl -s https://<preview-url>/openapi.json | head -c 40` returns
`{"openapi":"3.0.0"`
- [x] `curl -sI https://<preview-url>/openapi.json` returns 200 with
`content-type: application/json`
- [x] `curl -sI https://<preview-url>/humans.txt` returns 200 (control:
rewrite fall-through chain intact)

## Linear
- fixes GROWTH-1138


<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->

## Summary by CodeRabbit

* **New Features**
  * Added access to the OpenAPI specification at `/openapi.json`.
  * Requests are automatically routed to the API specification endpoint.

<!-- end of auto-generated comment: release notes by coderabbit.ai -->

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Co-authored-by: Aleksi Immonen <aleksi@supabase.io>
2026-08-28 17:26:43 +08:00
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