https://developer.mozilla.org/en-US/docs/Web/HTTP/Methods/PUT """ If the target resource does not have a current representation and the PUT request successfully creates one, then the origin server must inform the user agent by sending a 201 (Created) response. If the target resource does have a current representation and that representation is successfully modified in accordance with the state of the enclosed representation, then the origin server must send either a 200 (OK) or a 204 (No Content) response to indicate successful completion of the request. """ We are returning 200, at least for /patrons
Hum, eyes not reading the correct section, forget that...