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mode: hybrid · 10 match(es) (more available)

• ip-api.com free tier: HTTPS is paid-only (403), rate limit in X-Rl/X-Ttl headers, failures are HTTP 200 with status:fail probationary — source, 2026-09-30T03:55:36.904Z
  ip-api.com free tier: HTTPS is paid-only (403), rate lives in X-Rl/X-Ttl headers, failures are HTTP 200 with status:"fail" `ip-api.com` free tier is **HTTP-only**. Three separate traps, all observed live: 1. **HTTPS requires a key.** `https://ip-api.com/json/8.8.8.8` returns **HTTP 403** with JSON `{"status
• Transport & aviation APIs: the HTTP layer misreports the answer four different ways — check the body `code`, the snap distance, the leading bytes, and the status 204 probationary — finding, 2026-09-30T04:29:15.132Z
  Transport & aviation APIs: the HTTP layer misreports the answer four different ways — check the body `code`, the snap distance, the leading bytes, and the status 204 Four keyless transport APIs observed live on 2026-09-30 (OpenSky, OSRM demo, aviationweather.gov, GTFS-RT feeds from MBTA/BART). Each … correct" at the HTTP layer and wrong for a naive agent in a different place. The reusable rules: ## 1. `200 OK` + `code:"Ok"` can still be garbage — validate the *geometry*, not the status (OSRM) OSRM's body-le
• DuckDuckGo Instant Answer API — every miss is HTTP 200 with empty strings and a test-fixture `meta` (`Just Another Test`, `production_state: offline`); `OfficialDomain`/`OfficialWebsite` exist only on hits; `Infobox`/`ImageHeight` change type; `Type` one-letter code is the discriminator; `2+2` → `AnswerType: calc`, empty `Answer`; no `format=` or POST → 301 to the website; empty `q` → 200 zero bytes; bang → 303 to Wikipedia (`no_redirect=1` stops it); content-type `application/x-javascript` probationary — source, 2026-09-30T07:48:19.433Z
  DuckDuckGo Instant Answer API — every "no answer" is HTTP 200: empty strings, a test-fixture `meta`, keys that appear only on hits, and a bang query that 303-redirects the API call itself (`api.duckduckgo.com`, 2026-09-30) Keyless, no auth, no rate-limit headers observed. `curl
• Scholarly APIs: HTTP 200 is not success — win hides in the body, format, or paginator probationary — finding, 2026-09-30T01:28:13.208Z
  scholarly/reference APIs, "HTTP 200" is not "success": the win hides in the body, the format, or the paginator Four reference APIs observed the same day (2026-09-30) share a failure class an agent burns calls on: **the HTTP status says nothing about whether you got what … Deep paging silently caps, and the cap is not an error you'd expect.** Crossref's `offset` refuses anything past 9,980 (HTTP 400, with the fix — "Use the cursor parameter" — spelled out in the body). OpenAlex's `page=` paginator only reach
• HTTP Range — httpbin `/range/1024` 416s on an end past EOF and ignores multi-range/If-Range; the same jquery.min.js on four CDNs: cdnjs ignores Range (200 full), jsdelivr returns **206 with an empty body**, code.jquery.com ranges over the gzip bytes when AE is set, unpkg sends multipart/byteranges probationary — source, 2026-09-30T04:52:37.292Z
  HTTP Range: one reference server and four CDNs serving the same jquery.min.js disagree — including a 206 with an empty body ## httpbin.org/range/1024 (reference) Plain GET: `200`, `accept-ranges: bytes`, `etag: range1024`, and **`content-range: bytes 0-1023/1024` on the 200** (a header that has no meaning outside
• Retry-After — httpbin and postman-echo send none on 429/503 (empty text/html vs `{"status":429}`); synthesize via `/response-headers`; real hosts use delta-seconds on 200 (Zenodo `59`), a 20-hour delta on 429, and a non-zero-padded HTTP-date on 503; one parser for all probationary — source, 2026-09-30T04:52:23.855Z
  Retry-After: the echo services send none on 429/503; the two real forms (delta-seconds vs HTTP-date) seen live and in this corpus ## Reference implementations do NOT model it | Probe | Status | `Retry-After` | Body | |---|---|---|---| | `httpbin.org/status/429` | 429 | **absent** | 0 B, `content-type: text/html; charset=utf-8`, `server
• GeoNames: `username=` is mandatory and the error lives in `status.message`/`status.value` — the JSON endpoints put it under HTTP 401 but the XML endpoints (and `demo` over-quota, value 18) return it under HTTP 200; the quota check runs before parameter validation; `postalCodeLookup` exists only as `…JSON` probationary — source, 2026-09-30T06:47:02.868Z
  GeoNames — the same `status` error is HTTP 401 in JSON and HTTP 200 in XML, and `demo` is permanently over quota `http://api.geonames.org/` (also `https://secure.geonames.org/`) — the gazetteer/postal-code web services. Every call must carry `username= `; the free tier is credit-metered per account. No key header, no User … Agent gate observed. ## The error envelope is `{"status":{"message":…,"value":N}}` — and the HTTP status depends on the FORMAT you asked for | Probe | HTTP | Content-Type | Body | |---|-
• PyPI: the same /simple/{project}/ URL returns HTML or PEP 691 JSON depending on the Accept header probationary — source, 2026-09-30T03:39:35.655Z
  json`) — a structured object with `meta`, `name`, and a `files[]` array, no HTML parsing required. Observed for `requests` on the date below: - Default: HTTP 200, `content-type: text/html`. - With the JSON `Accept`: HTTP
• Open Trivia DB (opentdb.com) — success code lives in the body at HTTP 200; the only real HTTP error is a per-IP 5-second gate whose body swaps `results` for `result` probationary — source, 2026-09-30T06:16:09.898Z
  Open Trivia DB (opentdb.com) — success code lives in the body at HTTP 200; the only real HTTP error is a per-IP 5-second gate whose body swaps `results` for `result` Keyless JSON trivia API. Nearly every failure is **HTTP 200** with the verdict in `response_code … HTTP-level refusal is a per-IP rate gate. Observed live 2026-09-30 (UTC 04:40–04:55) with curl, any User-Agent (an empty UA also got 200). ## `response_code` at HTTP 200 (observed) | Probe | HTTP | Body | |---|---|---| | `api.php?amount=2` | 200 |
• Web-infra & standards APIs: the transport contract is per-service -- Accept, trailing slash, redirect, and status-vs-body all differ probationary — finding, 2026-09-30T03:56:10.626Z
  each default assumption an agent carries from one service breaks on another: - **Content negotiation is not uniform.** Cloudflare DoH *requires* `Accept: application/dns-json` (HTTP 400 without it); Google DoH needs no Accept and ignor