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If a rate limiter tells a caller to retry and then rejects the request at that time, its retry advice and enforcement decision are out of sync. HTTP defines what a retry hint means, but it does not identify the cause of a mismatch in a particular implementation. Start by comparing the exact time the limiter will accept a request with the value it puts in the response.
What Retry-After promises—and what it does not
HTTP 429 means a user has sent too many requests in a given amount of time. RFC 6585 says a 429 response may include a Retry-After header indicating how long to wait before making a new request. The RFC does not specify how a server identifies a user or counts requests; those details depend on the rate limiter.
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RFC 9110 defines two valid Retry-After formats: an HTTP date, or a non-negative decimal integer representing seconds after the response is received. A number of seconds is a duration, not a timestamp. RFC 6585’s Retry-After: 3600 is an illustrative example of the format, not a statistic or a general recommendation.
Tell an absolute retry date from a relative delay
| Format | Meaning | What to verify |
|---|---|---|
| HTTP date | A date and time at which the caller may retry. | It represents the same next-allowed boundary the limiter enforces. |
| Delay in seconds | A non-negative whole-number duration measured after the response is received. | It is calculated as a duration, not copied from an absolute timestamp or computed in a different unit. |
These are alternative ways to express retry timing, not interchangeable values. If an absolute reset time is mistakenly serialized as a relative number of seconds—or a duration is treated as a timestamp—the caller can be directed to the wrong moment.
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How to find where the advice and decision diverge
The title alone does not identify a language, library, endpoint, algorithm, or confirmed defect. Treat causes as hypotheses until logs or a reproduction show which value diverges. Trace the response-generation path and the enforcement path for the same request and rate-limit state.
- Record the enforcement boundary. Capture the limiter’s decision time and the exact instant at which it will accept another request.
- Record the serialized hint. Capture the Retry-After value, its intended format, its units, and any rounding applied before it is sent.
- Compare the next decision. At the advertised retry time, record the timestamp and the limiter’s accept-or-reject result.
- Check that both paths use the same basis. Confirm they use compatible clocks and the same rate-limit state, rather than calculating advice from stale or separate data.
Common failure modes to test
- Duration versus timestamp: an absolute reset time may have been encoded or interpreted as a relative delay.
- Seconds versus milliseconds: one path may calculate or serialize time in a different unit from the other.
- Rounding down: converting a fractional remaining interval to a whole number of seconds can advertise a delay shorter than the enforced wait.
- Different time or state: the advice and enforcement checks may rely on different timestamps or rate-limit data.
These are plausible engineering explanations for the symptom, not a diagnosis of any particular system. A focused reproduction should preserve the decision timestamps, next-allowed instant, serialized hint, units, rounding, and subsequent decision result so the mismatch can be traced.
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Make the hint match the enforced boundary
For a seconds-based hint, calculate the delay from a consistent decision instant and avoid advertising a wait shorter than the interval remaining before enforcement permits the request. For an HTTP-date hint, make sure the date corresponds to that same enforced boundary. These are implementation practices for keeping advice aligned with behavior; they are not additional requirements stated by RFC 9110.
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