When an HTTP 429 response includes Retry-After, a client should wait for the stated interval before trying again. Retrying during that window can keep sending requests while the server is rate-limiting them, extending the run of failures. The headline’s two-second blip and four-minute lockout describe a case-specific scenario; the HTTP standards do not establish those timings or guarantee that outcome.
What does HTTP 429 mean?
HTTP 429, “Too Many Requests,” means the server considers the requester to have sent too many requests in a given amount of time. RFC 6585 defines the status code, but does not impose one universal rate-limit duration or counting method. The limit may apply to a resource, a server, or multiple servers, and the service may identify a requester using credentials or cookies. RFC 6585, section 4
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A 429 response may include Retry-After to indicate how long to wait before making another request. It is optional, so a client cannot assume every 429 will provide it. RFC 6585, section 4
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How do I handle Retry-After?
Read the response header and honor it when present. RFC 9110 allows two forms: a delay in seconds or an HTTP-date. A client must handle both rather than treating every value as a number. The field tells the user agent how long it ought to wait before a follow-up request. RFC 9110, section 10.2.3
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- Parse the value. Determine whether
Retry-Afteris a number of seconds or an HTTP-date. - Wait until the indicated time. For a delay in seconds, wait that interval. For an HTTP-date, calculate the remaining delay before retrying.
- Retry only when safe. Check whether repeating the request could create duplicate effects, especially for operations that change data.
- Keep retries bounded. Set a limit on attempts and coordinate retries across concurrent workers so they do not all resume and send requests at once.
The standards specify the header’s meaning and the safety constraint on automatic retries; they do not prescribe a universal fallback schedule when the header is absent. Any client-side fallback should be bounded and should not be presented as a server-provided wait time.
Why can ignoring the header prolong failures?
If a client retries before the indicated wait has elapsed, it continues making requests during the server’s stated delay. Those requests can fail too, and repeated traffic can prolong the period in which the client sees errors. The duration and behavior depend on that service’s rate-limit policy; HTTP does not say that ignoring the header always causes a lockout or that the next wait will be four minutes.
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Accordingly, the two-second blip and four-minute lockout in the headline should be read as a case-specific framing, not as a general HTTP rule. Establishing those exact timings or proving that the retries caused the longer lockout would require the incident’s response headers and request timestamps, or a first-party account of what happened.
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Can I retry a POST after a 429?
Not automatically in every case. RFC 9110 says clients should not automatically retry a non-idempotent request unless they know the operation is idempotent or can determine that the original request was not applied. A 429 alone does not establish whether an operation took effect. Before retrying a POST, consider whether it could create a duplicate action and whether the API provides a way to make or verify the operation safely. RFC 9110, section 9.2.2
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Why do rate limits differ between services?
HTTP 429 identifies a rate-limit response, not the policy behind it. Services choose what they count, how they identify requesters, and how long a limit applies. A published vendor limit is therefore an example of that vendor’s configuration, not a benchmark or default for other APIs.
For example, Cloudflare’s support documentation, last updated August 14, 2026, lists 1,200 requests per five-minute period per user and a Client API limit of 200 per second per IP. Those figures describe Cloudflare’s documented limits only. Cloudflare’s HTTP 429 documentation
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