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.500, 503: Server Errors, something went wrong on our side.