Hull conform to standards regarding HTTP status codes to indicate success or failure of a request:
200: OK, The requested object exist.
201: Created, the object has been created.
400: Bad Request, required parameters are missing.
401: Unauthorized, Your App ID, Access Token and/or User ID are missing or invalid.
404: Not Found, the requested object doesn’t exist.
405: Method Not Allowed, the called method doesn’t exist.
503: Server Errors, something went wrong on our side.