Retry-After when the response has one. Errors never cost API credits.
Alura cannot fetch items it has never seen right now. Items it already knows are served as usual, and stale ones come back without a refresh.
What to do: Alura cannot fetch new items from Etsy right now; retry later.
Response
application/problem+json (RFC 9457) and has a Request-Id header with the same request_id. See all errors.