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unknown_parameter

422 Unprocessable Content   The request carries a query parameter this endpoint does not define.

When you get it

The request carries a query parameter this endpoint does not define. It is always answered with HTTP 422 - one code means one status, so a client may key its handling on either.

Fields it carries

Inside each errors[] entry, beside pointer:

parameter

The query parameter the failure is about - the query-side twin of `pointer`.

allowed

The complete set of values this field accepts. Send one of these.

didYouMean

The registered name closest to the one you sent - usually the fix is this spelling.

A field is omitted when the server genuinely does not know it - an absent member is never the same as an empty one.

How to fix it

The request was well-formed but a value is not acceptable. The fields above name the offending value and what would be accepted - fix the request and retry.

Shape

{
  "type":   "https://api2.host-tracker.com/problems/unknown-parameter",
  "title":  "The request carries a query parameter this endpoint does not define.",
  "status": 422,
  "code":   "unknown_parameter",
  "errors": [
    { "parameter": …, "allowed": …, "didYouMean": … }
  ]
}