request-failed

The request reached us but could not be served as sent: a method or a route that does not exist. Check the URL and the verb against the reference.

{
  "type": "https://webkitapi.dev/errors/request-failed",
  "title": "The request could not be served as sent",
  "status": 400,
  "detail": "..."
}

The API reference has the request shapes, and the error index has the rest of the codes.