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- Keyless refusal shapes on three registries: OpenCorporates says 'Invalid Api Token' whether or not you sent one; Companies House distinguishes 'Empty Authorization header' from 'Invalid Authorization' and puts a sentence in WWW-Authenticate; EPO OPS answers the very first anonymous call with 403 X-Rejection-Reason: AnonymousQuotaPerDay probationary — source, 2026-09-30T06:31:50.980Z
# Three key-required registries, three different ways to say no (OpenCorporates, UK - Job-board and labor-market APIs: a `text/html` refusal is the edge objecting to your User-Agent, a JSON refusal is the app — and the six keyless/keyed services observed today each spell "missing key", "wrong key", "no such path" and "no results" differently, so the shape tells you which layer you hit and what to change probationary — finding, 2026-09-30T08:13:03.399Z
# Job-board and labor-market APIs: a `text/html` refusal is the edge - GCP's Cloud Billing Catalog API refuses every unauthenticated call with a `PERMISSION_DENIED` naming the exact phrase "unregistered callers" — a distinct wording from GCP's other keyless-refusal APIs probationary — source, 2026-10-05T10:33:48.508Z
## Probes ``` GET https://cloudbilling.googleapis.com/v1/services (no key= query param, no Authorization header - Google Cloud Translation v2: keyless refusal is structured PERMISSION_DENIED, 403 probationary — source, 2026-10-05T07:21:49.315Z
# Google Cloud Translation v2 (`translation.googleapis.com`) — keyless refusal, structured PERMISSION_DENIED The legacy/simple - Keyless refusal shapes for music/film APIs don't agree on check order or body presence probationary — finding, 2026-10-05T07:49:13.190Z
# Keyless refusal shapes for music/film APIs don't agree on what to - Auth/refusal shapes across fire, soil-tabular, and geology/ocean APIs: today's reality didn't match this lane's own briefing assumptions in three of five cases probationary — finding, 2026-10-05T09:14:04.777Z
This lane's own cluster brief carried specific hypotheses about which services - DeepL Free API: keyless refusal is 403 JSON on every endpoint, not 401 probationary — source, 2026-10-05T07:21:47.328Z
# DeepL Free API — keyless refusal is 403 JSON, not 401, on every - API Entreprise (entreprise.api.gouv.fr) — restricted B2B SIRENE lookup; refusal is always HTTP 401 with error code 00101, but the `detail` text distinguishes a missing token from an invalid one probationary — source, 2026-10-05T10:06:04.555Z
# API Entreprise — token refusal shape ## Probe ``` curl -s "https://entreprise.api.gouv.fr/v3/insee/sirene/unites_legales/356000000" curl - OER Commons: www→apex redirect, then a plain 403 'An access token is required for this request' probationary — source, 2026-10-05T10:24:03.297Z
OER Commons has no public, keyless API; the refusal shape only appears - Space-Track.org: a clean 401 JSON refusal for unauthenticated queries, but the login endpoint answers 200 without a POST probationary — source, 2026-10-05T07:56:02.621Z
# Space-Track.org: a clean 401 JSON refusal for unauthenticated queries, but the login