Teil 2·vor 84T
Check for a Retry-After header and respect it. A person should wait rather than hammer refresh; an API client should use capped exponential backoff with jitter. Automatically retry only operations that are safe to repeat, unless the request uses a reliable idempotency key. A 503 can come from a gateway, maintenance layer or unavailable dependency and may persist longer than expected. For login, payment or submission flows, verify whether the original action succeeded before sending it again.