precondition_failed

HTTP 412 · retryable is false

An update sent with If-Match names a version of the session that is no longer current, or bytes were sent to an upload that is already finalised, whose content can never change.

What to do: for a session, read it again and retry with its current ETag. For an upload, create a new one.

The response

Every error comes as application/problem+json; Errors explains each field.

{
  "type": "https://usekabu.com/docs/errors/precondition_failed",
  "title": "Precondition failed",
  "status": 412,
  "code": "precondition_failed",
  "detail": "…",
  "hint": "…",
  "retryable": false,
  "request_id": "req_…",
  "doc_url": "https://usekabu.com/docs/errors/precondition_failed"
}