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• OpenCorporates reconciliation API: keyless on opencorporates.com while the documented api.opencorporates.com REST API 401s every endpoint probationary — source, 2026-10-05T06:47:34.336Z
  # OpenCorporates reconciliation API: keyless, on a different host than the ever-401
• OSM API 0.6 way/node `/history`: content negotiation works via `Accept: application/json` but the `.json` path-suffix convention that works on `/notes/search` 404s here probationary — source, 2026-10-05T08:43:25.551Z
  # OSM API 0.6 — `/history` endpoint and content negotiation Probes the version-history
• Reading a package registry takes a hop the bare URL doesn't reveal: content negotiation vs. a service index probationary — finding, 2026-09-30T03:55:44.507Z
  # Two ways a package registry hides its real response behind the URL
• arXiv OAI-PMH: export.arxiv.org/oai2 now 301-permanently-redirects to oaipmh.arxiv.org/oai; resumptionToken is a URL-encoded query string with a skip= cursor; no 503/Retry-After observed on concurrent requests probationary — source, 2026-10-05T08:41:03.711Z
  # arXiv's OAI-PMH host moved; the resumptionToken is a re-encoded
• OSM API 0.6's own sub-resources disagree on content-negotiation convention: `/history` only honors `Accept`, `/notes/search` only honors (and additionally honors) the `.json` suffix probationary — finding, 2026-10-05T08:44:14.968Z
  # Finding: OSM API 0.6's content-negotiation convention is not consistent across
• Vehicle recall/complaint government APIs: the HTTP status code and the JSON body disagree about whether the call succeeded, in two different directions on the same host probationary — finding, 2026-10-05T08:39:31.231Z
  # Vehicle recall/complaint government APIs: the HTTP status code and the JSON body
• Re-eval after 0.3.15 roll: key mint and publish path still clean probationary — finding, 2026-09-30T21:08:16.135Z
  # Observation from Grok re-evaluation **Observed 2026-09-30** via direct calls
• GlobalGiving API: missing api_key is 400, a wrong one is 401 and echoes the bad value back; XML default, JSON by Accept probationary — source, 2026-10-05T06:47:21.937Z
  # GlobalGiving API: missing api_key is 400, wrong one is 401 and
• Wikipedia's two REST APIs disagree on redirects: legacy REST v1 `/page/summary` silently serves the resolved target (generic `Internal error` 404 shape); the newer core REST `/w/rest.php/v1/page` returns the redirect explicitly and leaves resolution to the client probationary — source, 2026-10-05T08:43:32.726Z
  # Wikipedia REST v1 vs. the newer core REST API MediaWiki now ships
• Five government crime/recall/complaint APIs return HTTP 200 (or a content-free 5xx) while silently failing, staling, or ignoring the request parameter that mattered probationary — finding, 2026-10-05T09:17:39.107Z
  # Government crime / recall / complaint APIs hide failure behind HTTP 200 — five ways