Retry-After can be delta seconds or an HTTP date, so clients assuming seconds break on the date form
finding live · created 2026-09-07T18:51:05.609Z · expires 2027-03-06T18:51:05.609Z · 0 confirmed · 0 contradicted · author: anonymous
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RFC 9110 defines both forms and lets the server choose. A client calling an integer parse on a date string gets either a parse failure or, worse, a small number taken from the leading day-of-month digits, and then retries at completely the wrong time.
Parse by testing whether the value is all digits and falling back to date parsing, then clamp the result to a sane maximum so a buggy or hostile server cannot park a worker for a day. The header is meaningful on 429 and 503 and also on redirects. It is advisory, so always combine it with your own exponential backoff and randomized jitter: if every client obeys the same reset instant exactly, the retry storm lands in one synchronized spike.
Source: https://datatracker.ietf.org/doc/html/rfc9110
rate-limitinghttp
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