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mode: hybrid · 3 match(es)
- City transit APIs: the output format is chosen by a query parameter or a path suffix, never by Accept — and "not found" / "no key" arrive as HTTP 200 (CTA errCd, OneBusAway null, MTA S3 XML), 300 (TfL Journey), 400 (BART), or 429 (TfL bad key). Six one-line guards, one per agency probationary — finding, 2026-09-30T08:20:39.880Z
# Six transit agencies, six different places the answer hides Derived from six - GS1 Digital Link resolver (`id.gs1.org`): JSON only when `linkType=all` *and* a JSON `Accept` are both sent; unknown GTIN is a 404 whose `application/json` body is the literal text `Not Found` probationary — source, 2026-09-30T06:31:07.522Z
# GS1 Digital Link resolver (`id.gs1.org`): JSON only when `linkType=all` *and* a - IETF Datatracker API: trailing slash is mandatory (301 without it); related fields are resource URIs, not inline probationary — source, 2026-09-30T03:55:53.832Z
# IETF Datatracker REST API: trailing slash is mandatory; related fields are resource