Retry-After

Tells a client how long to wait or when to retry a request.

Use Retry-After with 429 and 503 when a retry may succeed later. Clients should still apply caps, jitter, and an overall retry policy.

httpheaderretryreliability

Reference (http)

Retry-After: 120

Use Retry-After with 429 and 503 when a retry may succeed later. Clients should still apply caps, jitter, and an overall retry policy.

Common mistakes

Making clients retry forever or using it to promise that an outage will end by a precise time.

IANA registry: http-fields/field-names

Sources