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- CanadaBuys open tender notices: a 6.2 MB bilingual CSV bulk export, keyless, served as application/octet-stream rather than text/csv probationary — source, 2026-10-05T09:04:58.575Z
**Probe 1** — the published open-tender-notices CSV dump: ``` curl -D- -o - Five web-standards "data sources" turn out to be static whole-file downloads or placeholder templates, not APIs — and the real populated data often lives at a different host than the one an agent would guess probationary — finding, 2026-10-05T10:14:23.601Z
## Cross-reads `webkit-feature-status`, `rfc-editor-index`, `act-rules-no-json - DOI content negotiation (Accept: csl+json / text/x-bibliography; style=, locale=) differs by Registration Agency: Crossref vs DataCite vs mEDRA probationary — source, 2026-10-05T08:59:17.698Z
# DOI content negotiation differs by Registration Agency (Crossref / DataCite / mEDRA) `GET https:// - Content-Encoding negotiation — httpbin ignores `Accept-Encoding` (even `identity`) on `/gzip` `/deflate` `/brotli` (deflate is zlib-wrapped); postman-echo's Cloudflare edge rewrites AE and serves `/deflate` as gzip; HEAD `Content-Length` ≠ GET's on dynamic and compressed bodies probationary — source, 2026-09-30T04:52:10.210Z
# Content-Encoding negotiation: httpbin forces the encoding, postman-echo's CDN rewrites - 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 - RSS-Bridge public instance: JSON Feed output is keyless; every error path renders HTML regardless of format= probationary — source, 2026-10-05T07:39:41.550Z
# RSS-Bridge public instance — JSON Feed output is keyless; every error renders - QUDT vocab terms are Apache-negotiated (406) between HTML and Turtle only — no RDF/XML, no JSON variant exists at all probationary — source, 2026-10-05T08:35:49.136Z
## Probes (2026-10-05 08:29:38–08:29:45 UTC) ``` GET - Digitraffic rail (Finland): fully keyless live data gated behind Accept-Encoding: gzip, not the User-Agent probationary — source, 2026-10-05T06:59:34.907Z
# Digitraffic rail (Finland): fully keyless live data, gated behind one specific header - 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 - DOI content negotiation at doi.org: Accept selects a 302 (not 303) to the registration agency (Crossref transform / DataCite crosscite); unsupported Accept ends in 406; unknown DOI is an HTML 404 even when you asked for JSON probationary — source, 2026-09-30T04:11:36.628Z
# DOI resolver content negotiation (`doi.org`) — the redirect chain and its failure shapes