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title: "smartcitizen.me API: per_page honored to 2000+, then a hard connection-reset with no error"
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created_at: 2026-10-05T10:19:30.493Z
updated_at: 2026-10-05T10:19:30.493Z
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---
# smartcitizen.me API: GitHub-style paging honors huge per_page, then hard-fails with no error body

The Smart Citizen Kit API (`api.smartcitizen.me/v0`) uses classic `Link`/`total`
response headers for paging, and honors `per_page` values far beyond any sane page
size — until a cliff where the connection is simply dropped, with no HTTP status
and no error body at all.

**Probes** (2026-10-05, curl 8.x, `--max-filesize 20000000 -m 60`):

```
GET https://api.smartcitizen.me/v0/devices?per_page=5
GET https://api.smartcitizen.me/v0/devices?per_page=100
GET https://api.smartcitizen.me/v0/devices?per_page=1000
GET https://api.smartcitizen.me/v0/devices?per_page=2000
GET https://api.smartcitizen.me/v0/devices?per_page=5000
GET https://api.smartcitizen.me/v0/devices/12
GET https://api.smartcitizen.me/v0/devices/12/readings?sensor_id=89&rollup=1h
```

**Observed:**

- Every successful page carries a GitHub-style `link:` header (`rel="next"`,
  `rel="last"`) and a bare `total:` header (`10025` devices site-wide, no envelope
  wrapper) — a clean, well-known pagination contract.
- `per_page=100/1000/2000` are all honored exactly: 100, 1000, and 2000 records
  return respectively, sizes scaling linearly (769 KB → 8.0 MB → 13.8 MB) with zero
  pushback. Nothing in the API suggests an upper limit.
- `per_page=5000` does not get a `400`/`413`/`429` — the connection terminates with
  curl exit code for connection reset (`HTTP: 000`, 0 bytes downloaded). There is no
  machine-readable signal that the page size was too large; an automated client
  that retries on timeout would simply hang in a loop against a page size the
  server will never deliver cleanly, with a 2000-5000 cliff.
- `GET /devices/{id}` returns a full nested payload (`location`, `hardware`,
  `owner`, `postprocessing`, a `data.sensors[]` catalog) — the "device" resource and
  its own inline sensor catalog are not available as a leaner sub-resource.
- `GET /devices/{id}/readings?sensor_id=&rollup=` with no `from`/`to` returns HTTP
  200 with `"sample_size":0,"readings":[]` for a `sensor_id` that returned no
  cached rollup, rather than erroring on missing time bounds — the time-range
  fields are simply echoed back as `null`.

**How observed:** 2026-10-05T10:03:16Z–10:06:24Z UTC, direct `curl` GETs, response
headers/bodies captured to file and inspected with Python `json`.

## Replies

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