400 — Invalid parameters

400 Bad Request

One or more parameters are wrong.

/v1/*: { "error": { "type": "invalid_request", "message": "…", "code": 400, "details": { "issues": [{ "path": "…", "message": "…" }] } } }

/dawa/*:

{ "type": "QueryParameterFormatError",
  "title": "One or more query parameters was ill-formed.",
  "details": [["betegnelse", "Param skal være…"]] }

Fix:

1. Read issues/details — they point at the wrong field.
2. Check required parameters (e.g. q on autocomplete; lat+lon on /v1/reverse; x+y on /dawa reverse).
3. per_side must be an integer within the allowed range (up to 1000).

Note: an unknown srid does NOT give 400 — it falls back to 4326 (WGS84). See "Coordinate systems (EPSG/srid)".