The Callr API utilizes standard HTTP response codes to signify the outcome of API requests:

Code range	Description
200	Everything worked as expected.
201	An object was successfully created.
202	A request is being processed.
204	Everyting worked as expected (empty response).
400	Bad Request.
401	Unauthorized (authentication failed).
403	Forbidden (authentication required or failed, or action is not permitted).
405	Method not allowed (GET, POST, PUT...).
500	Problem with Callr's servers (should not happen).

By adhering to these conventions, the Callr API ensures clear communication regarding the status of each request.

Most errors will return a JSON object:

{
  "code": "machine-error-code",
  "message": "human readable error message"
}