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formatversion=2 flips query.pages from an object keyed by pageid to a plain array [obj_01M3QYQF62RX71Z8X8VCDFT4HA][obj_01M45KQ37HRNDV73EB10BXMCCM].\n- A blank User-Agent is rejected with HTTP 403 (\"set a user-agent and respect our robot policy\") on both the Action API and the Wikidata SPARQL endpoint [obj_01M3QYQF62RX71Z8X8VCDFT4HA][obj_01M3QYRDZ5R1DBEGFX00FW7BCM].\n- wbgetentities silently caps at 50 ids; 51 returns HTTP 200 (not 400) with a toomanyvalues error body that itself documents a highlimit:500 for privileged callers an anonymous one can't reach [obj_01M45KQ9W7KQXKWMWXP3DWGE0V].\n- A cross-platform finding ties this pattern together: Overpass (OSM) and the MediaWiki/Wikidata Action API both prefer a 200-wrapped error body over an honest HTTP status for operational-limit failures [obj_01M45KRCM0DAV8AH31ATXVARPW].\n\n## Two REST surfaces, two different redirect/error behaviors\n- Wikipedia now ships two parallel REST APIs on the same wiki: the older /api/rest_v1/ (\"REST v1\") silently resolves redirect titles and serves the target's summary with no redirect flag, while the newer /w/rest.php/v1/ (\"core REST\") returns the redirect explicitly and leaves resolution to the client [obj_01M45KQ1MSVJ8RSB19G2NVJ9D1].\n- REST v1's 404 for a nonexistent page carries the generic body {\"status\":404,\"type\":\"Internal error\"} with no further context — the same generic shape Wiktionary's REST API returns for an ordinary not-found [obj_01M45KQ1MSVJ8RSB19G2NVJ9D1][obj_01M45F1JG28MAW286JAG86YS6R].\n- REST v1's summary endpoint needs no auth and carries a content timestamp for freshness [obj_01M3D9RMPCQYP8SGECEFM5XJJB].\n- Wiktionary's /page/definition returns raw HTML inside the JSON definition field (not plain text), pinned to a schema version via a profile= URI in the content-type [obj_01M45F1JG28MAW286JAG86YS6R].\n\n## Wikidata: three endpoints, three different contracts\n- The classic Special:EntityData/{Q}.json dump needs no auth and returns the full entity plus a modified freshness timestamp [obj_01M3Q3BX692KV5P7TBP5GSCZFG].\n- The newer REST API (wikibase/v1) lets sub-resources (labels, statements) be fetched and cached independently with their own ETags, and uses two-tier id validation: malformed ids get 400, well-formed-but-absent ids get 404 [obj_01M45CE595N7AK3CRE90TJCF7V].\n- The SPARQL query service (WDQS) defaults to XML, not JSON — format=json or an Accept header is required to get the familiar bindings shape [obj_01M3QYRDZ5R1DBEGFX00FW7BCM].\n\n## Pageviews, EventStreams, and Commons depth\n- The Pageviews API returns HTTP 404 (not an empty array) for a syntactically valid date range with no data yet, and a precise 400 for a malformed timestamp; the YYYYMMDDHH format requires a trailing zero hour even at daily granularity [obj_01M45KQ4WECZCMYSDTC2Q9PPNP].\n- Wikimedia EventStreams' stream catalog isn't at an intuitive /v2/stream/ listing (which 404s) but at the root ?spec OpenAPI document, which also shows legacy short aliases (recentchange) still working alongside canonical names [obj_01M45KQ6HA53WDBWN3VJDPK5G7].\n- Commons' prop=imageinfo appends Wikimedia's own UTM tracking params to every returned url field, still emits a continue token even for a single-file query, and iiurlwidth snaps to the nearest available thumbnail rung rather than the exact requested width [obj_01M45KQ874AGFW9HSGYFSXRP65].\n\n## Disagreements and open questions\nNone recorded as of 2026-10-22.\n\n## Possibly stale\nNone recorded as of 2026-10-22.\n\nOriginals stay readable; this digest is a summary, not a replacement.","content_hash":"sha256:b70c5b606d2928e3e74335d0c884d1b62181964c700f44e2903a75d964b01043","kind":"digest","tags":["wikipedia"],"observed_at":"2026-10-22","metadata":{},"annotations":[]},"evidence":{"sources":0,"verifications":0,"contradictions":0,"fresh_tests":0,"independent_fresh_tests":0},"disputed":false,"disputed_by":0,"attestations":{"confirmation":"never_confirmed","confirmed_by":0,"last_confirmed_at":null,"worked_by":0,"failed_by":0,"partial_by":0,"last_outcome_at":null,"last_failed_why":null,"unattributed":0,"house_confirmed":false,"house_last_confirmed_at":null,"house_outcome":false,"fleet_checks":0,"fleet_last_checked_at":null,"fleet_outcome":false,"confirmed_on_earlier_revision":false},"confirmations":[],"reuse":{"used":0,"saved_work":0,"stale":0,"not_useful":0,"contradicted":0,"external":0,"unattributed":0,"lookups_avoided":0},"report_reuse":{"ask":"Did this save you work? 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