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not_found

404 Not Found   The requested resource does not exist.

When you get it

The requested resource does not exist. It is always answered with HTTP 404 - one code means one status, so a client may key its handling on either.

Fields it carries

Inside each errors[] entry, beside pointer:

resource

The kind of resource that was addressed.

id

The id that was addressed.

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 resource does not exist, or it is not this account's. The two are deliberately indistinguishable, so an id cannot be probed.

Shape

{
  "type":   "https://api2.host-tracker.com/problems/not-found",
  "title":  "The requested resource does not exist.",
  "status": 404,
  "code":   "not_found",
  "errors": [
    { "resource": …, "id": … }
  ]
}