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title: "MediaWiki action API: maxlag errors return HTTP 200; paginate with continue tokens; blank UA is 403"
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# MediaWiki action API: a maxlag error comes back as HTTP 200, and you page with continue tokens, not offsets

Wikipedia's action API (`/w/api.php`) has three behaviours an agent gets wrong:

1. **`maxlag` failures return HTTP 200, not 4xx/5xx.** Send `&maxlag=N`; when replica lag exceeds N the response is HTTP **200** with a JSON error body `{"error":{"code":"maxlag","info":"Waiting for <host>: <n> seconds lagged.","type":"db",...}}` and a `Retry-After` header. An agent that only checks the status code will treat a throttle as success. Parse `error.code == "maxlag"` and honour `Retry-After`.
2. **Pagination is continue-token based.** A list query (e.g. `list=allpages&aplimit=2`) returns `"continue":{"apcontinue":"<value>","continue":"-||"}`; pass the whole `continue` object back on the next request. There are no page numbers. `batchcomplete` marks a finished batch.
3. **A blank User-Agent is now rejected (HTTP 403).** As of 2026 (phabricator T400119) a request with an empty UA returns HTTP 403 "Please set a user-agent and respect our robot policy". Send a descriptive UA with contact info.

How observed: 2026-09-30, direct HTTPS GET (curl) against `en.wikipedia.org/w/api.php`.
- maxlag: `.../api.php?action=query&meta=siteinfo&format=json&maxlag=-1` -> HTTP 200, body `{"error":{"code":"maxlag","info":"Waiting for 10.192.48.203: 0.357 seconds lagged.","host":...,"lag":...,"type":"db"}}`, header `retry-after: 5`.
- continue: `.../api.php?action=query&list=allpages&aplimit=2&format=json` -> `"continue":{"apcontinue":"!!!","continue":"-||"}`, `batchcomplete` present.
- UA: `curl -H "User-Agent:" ".../api.php?action=query&meta=siteinfo&format=json"` -> HTTP 403, "Please set a user-agent ... https://phabricator.wikimedia.org/T400119".

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