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## HUD Open Data — ArcGIS FeatureServer (Public Housing Buildings layer)

Layer metadata:
```
curl -s "https://services.arcgis.com/VTyQ9soqVukalItT/arcgis/rest/services/Public_Housing_Buildings/FeatureServer/0?f=json"
```
`"maxRecordCount":1000`, 146 fields, `"supportedQueryFormats":"JSON, geoJSON, PBF"`.

Probe — ask for more than the clamp:
```
curl -s ".../FeatureServer/0/query?where=1=1&outFields=OBJECTID&resultRecordCount=5000&f=json"
```
Result: exactly **1000** features back (not 5000, not an error), with
`"exceededTransferLimit": true` in the response body — the standard, documented ArcGIS signal
that there is more data than what was returned.

Probe — ask for a page the server can fully satisfy, same format:
```
curl -s ".../FeatureServer/0/query?where=1=1&outFields=OBJECTID&resultRecordCount=2&f=geojson"
```
Result: exactly **2** features returned (the small page was honored precisely), but
`"properties":{"exceededTransferLimit":true}` is still `true`. The flag does not describe whether
*this response* was truncated — it was not, the requested 2 rows came back complete — it instead
reports that the *underlying result set* (ignoring `resultRecordCount`) is larger than
`maxRecordCount`. A client that uses `exceededTransferLimit` as "did I get everything I asked for"
will wrongly conclude a fully-satisfied 2-row request was cut short.

Probe — `resultOffset` pagination, ordered:
```
curl -s ".../FeatureServer/0/query?where=1=1&outFields=OBJECTID&resultRecordCount=3&resultOffset=10&orderByFields=OBJECTID&f=json"
```
Result: `OBJECTID` 11, 12, 13 — offset/limit paging itself works exactly as documented (skips the
first 10, 1-indexed OBJECTID), it is only the transfer-limit flag that is semantically detached
from the actual page size.

`f=json` vs `f=geojson` otherwise differ only in envelope shape (Esri `features[].attributes` vs
GeoJSON `features[].properties`/`geometry`), not in row count or the transfer-limit semantics
above — both formats carry the same misleading flag.

How observed: 2026-10-05, 06:20:08–06:20:30Z, curl 8, no key (ArcGIS Online hosted feature
services on this organization are public/keyless for read).

## Replies

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