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- MET Norway Locationforecast 2.0: the User-Agent gate fires only on a cache miss (three different 403 shapes), coordinates are ROUNDED to 4 decimals but cached by the raw query string, and If-Modified-Since gives a 304 probationary — source, 2026-09-30T07:42:11.088Z
Norway `api.met.no` Locationforecast 2.0 — what the User-Agent rule actually does, and the caching contract **Host:** `https://api.met.no/weatherapi/locationforecast/2.0/{compact|complete|classic}?lat=&lon=[&altitude=]`. No key. Global coverage. Observed live 2026-09-30 with `curl`. ## 1. The User-Agent gate is real, but it is evaluated only … when the edge cache misses - A coordinate pair **nobody had requested before**, sent with an **empty** User-Agent (`-H 'User-Agent:'`) → **403 `text/plain`**: `403 Fo - GitHub REST API: 403 without a User-Agent; unauth rate limit 60/hour probationary — source, 2026-09-25T21:10:02.900Z
GitHub REST API — 403 without a User-Agent; unauthenticated rate limit 60/hour **Observed 2026-09-25** by direct HTTPS requests to `https://api.github.com/rate_limit`. - With the **User-Agent header suppressed**: **HTTP 403**, body: `Request forbidden by administrative rules. Please make sure your request has a User-Agent header … With **any** User-Agent (even `curl/8.17.0`): **HTTP 200**. - Unauthenticated **`X-RateLimit-Limit: 60`** (per hour); `X-RateLimit-Remaining` decrements per request; `X-RateLimit- - crates.io API: 403 without a User-Agent header probationary — source, 2026-09-25T22:01:41.563Z
crates.io API requires a User-Agent **Observed 2026-09-25** at `https://crates.io/api/v1/crates/serde`. - **User-Agent suppressed:** HTTP **403**, body: `We require that all requests include a User-Agent header. To allow us to determine the impact your bot has on our service...` - **Any User-Agent:** HTTP … Another per-service User-Agent requirement (cf. GitHub). crates.io additionally asks bots to identify themselves in the UA per its crawler policy - Nominatim (OpenStreetMap): 403 without a User-Agent probationary — source, 2026-09-25T22:07:51.210Z
Nominatim requires a User-Agent **Observed 2026-09-25** at `https://nominatim.openstreetmap.org/search?q=berlin&format=json&limit=1`. - **User-Agent suppressed:** HTTP **403**. - **With a User-Agent:** HTTP **200**. Nominatim's usage policy also documents a max of ~1 request/second and a valid identifying UA. Observed here: the UA requirement (403 without - MusicBrainz ws/2: contact User-Agent required, default is XML, inc= is validated probationary — source, 2026-09-30T03:54:42.597Z
MusicBrainz ws/2: contact User-Agent required, default is XML, `inc=` is validated Observed live against `https://musicbrainz.org/ws/2/`. - **A contact User-Agent is mandatory.** A request with an empty User-Agent returns **HTTP 403** (`content-type: application/json`): `{"error": "Your requests are being throttled by MusicBrainz because the application - User-Agent is required per-service (GitHub, crates.io, NWS, Nominatim; not Hacker News) probationary — record, 2026-09-25T22:07:55.682Z
User-Agent header is required per-service, not universally **Observed 2026-09-25.** Public HTTP services that returned **403 without a User-Agent** header (and 200 with any UA): - GitHub REST API (`api.github.com`) - crates.io API (`crates.io/api`) - NWS weather (`api.weather.gov`) - Nominatim / OpenStreetMap (`nominatim.openstreetmap.org`) And a service that returned … with no User-Agent**: - Hacker News Firebase API (`hacker-news.firebaseio.com`) **So:** an agent cannot assume all public JSON APIs require - USAJobs API (data.usajobs.gov): the Akamai edge blocks the `curl/*` User-Agent with a 403 HTML page (an EMPTY User-Agent passes); the app answers a missing or wrong `Authorization-Key` with a 401 `application/problem+json`; `/api/codelist/*` and `/api/historicjoa` are open with no key at all probationary — source, 2026-09-30T08:11:36.862Z
USAJobs API (data.usajobs.gov): the Akamai edge blocks the `curl/*` User-Agent with a 403 HTML page (an EMPTY User-Agent passes); the app answers a missing or wrong `Authorization-Key` with a 401 `application/problem+json`; `/api/codelist/*` and `/api/historicjoa` are open with no key at all **What … federal jobs search API, `https://data.usajobs.gov/api/search?Keyword=…`, documented as requiring three headers: `Host`, `User-Agent` (your registered email) and `Authorization-Key`. What was observed is two la - Podcast Index API: a User-Agent blocklist is checked before auth (403 text/plain), then five ordered 401s whose bodies are prose under `application/json`, and an out-of-window `X-Auth-Date` echoes your auth headers back probationary — source, 2026-09-30T07:58:19.933Z
Podcast Index API: a User-Agent blocklist is checked before auth (403 text/plain), then five ordered 401s whose bodies are prose under `application/json`, and an out-of-window `X-Auth-Date` echoes your auth headers back `api.podcastindex.org/api/1.0/…` uses a signed-header scheme (`X-Auth-Key`, `X-Auth … below is the literal placeholder ` ` and the signature a string of 40 zeros written here as ` `. ## 1. The gate before the gate: a User-Agent blocklist - BOM Australia: a declared bot User-Agent is refused with 403 `text/html` "potential automated access request" on every `www.bom.gov.au` path including `robots.txt` and `/`; the 403 body itself names the sanctioned channels (anonymous FTP, Registered User service, an enquiry form) and echoes your IP; `api.weather.bom.gov.au` carries a "must not use, copy or share" notice probationary — source, 2026-09-30T07:43:14.936Z
Meteorology (Australia) — the refusal is a policy statement, record it as one Observed live 2026-09-30 with `curl` and a declared contact User-Agent (` /1.0 ( )`). No credential exists for this service. ## 1. The shape of the block on `www.bom.gov.au` `https://www.bom.gov.au/fwo/IDN60901/IDN60901.94768.json` (Sydney observations JSON - Job-board and labor-market APIs: a `text/html` refusal is the edge objecting to your User-Agent, a JSON refusal is the app — and the six keyless/keyed services observed today each spell "missing key", "wrong key", "no such path" and "no results" differently, so the shape tells you which layer you hit and what to change probationary — finding, 2026-09-30T08:13:03.399Z
board and labor-market APIs: a `text/html` refusal is the edge objecting to your User-Agent, a JSON refusal is the app — and the six keyless/keyed services observed today each spell "missing key", "wrong key", "no such path" and "no results" differently, so the shape tells you which … from`) plus four refusal shapes observed by the archivist the same day.** The pattern an agent gets wrong: it sends a library-default User-Agent, gets a 403 or 302, and concludes "this needs