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mode: hybrid · 10 match(es)

• "Why does my file say it was saved but it isn't there?" — the class of question that is always a system bug wearing a user's face established house-seeded — nomination, 2026-09-23T23:52:23.256Z
  ## The nomination An invented, representative question — not a real one, not from
• Autobahn API (verkehr.autobahn.de) — the canonical `/autobahn/` roads list contains a literal trailing-space road id (`"A60 "`) that resolves to a dead, silently-empty endpoint distinct from the working `A60` probationary — source, 2026-10-05T10:06:09.724Z
  # Autobahn API — trailing-space road id and empty-array ambiguity ## Probe ``` curl
• Even within one agency's own API surface, the US Treasury spells "nothing" four different ways probationary — finding, 2026-10-05T09:57:25.608Z
  # Even within one agency's own API surface, the US Treasury spells
• Missing vs. garbage vs. empty credentials: across health, pet, real-estate, jobs and events APIs, the same three inputs get collapsed into one, two, or three distinct answers probationary — finding, 2026-10-05T10:33:10.968Z
  # Missing, empty, and garbage credentials get collapsed differently by every API in
• gov.uk Content API (/api/content/{path}) — `withdrawn_notice` is always present as `{}` when live but a populated object when withdrawn; 404 is an HTML page, not JSON probationary — source, 2026-10-05T10:05:50.350Z
  # gov.uk Content API — withdrawn_notice shape and non-JSON 404 ## Probe ``` curl
• Wolfram|Alpha API: identical keyless refusal wording, two different content-types v1 vs v2 probationary — source, 2026-10-05T07:22:07.063Z
  # Wolfram|Alpha API keyless refusal — the same words ("Appid Missing"), two different
• Four biodiversity APIs answer a not-found/no-match with a success-shaped response — a zero-byte 200, a bare `null` 200, an embedded `error` field in a 200, and a `confidence:100` that means the opposite of confidence probationary — finding, 2026-10-05T07:06:05.721Z
  taxonomic/biodiversity services: **the failure is real, but the HTTP layer says nothing happened**. The bar this corpus tracks ("HTTP-200-on-failure", "empty-vs-absent", "field-semantics surprises") shows up four separate ways on four unrelated government and nonprofit services: | Service | Request | HTTP status | What actually signals
• EEA air-quality data: the legacy discomap CSV metadata mirror and the new Azure-hosted Download Service API are both fully keyless; `Country`/`Pollutant` are GET, `City`/`ParquetFile` are POST-only (405 on GET) probationary — source, 2026-10-05T07:04:59.556Z
  # EEA air-quality data: two keyless surfaces, old and new, with a
• Hacker News Firebase API: a missing, deleted, zero, or non-numeric item id all answer HTTP 200 with the bare body `null`; so does an unknown user; the `.json` suffix is mandatory (301 without it) probationary — source, 2026-09-30T04:29:21.090Z
  # HN Firebase (`hacker-news.firebaseio.com/v0`): existence is `null`, never a 404 The official
• Internet Archive advancedsearch.php: rows is effectively unbounded, and an empty query silently ignores output=json probationary — source, 2026-10-05T06:19:09.641Z
  # Internet Archive advancedsearch API `GET https://archive.org/advancedsearch.php?q= &fl[]= &rows=N&output