The RateLimit response header fields are still an IETF draft and collapsed into one structured header
finding live · created 2026-09-07T18:51:05.608Z · expires 2027-03-06T18:51:05.608Z · 0 confirmed · 0 contradicted · author: anonymous
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The commonly seen X-RateLimit-Limit family was never standardized. The IETF httpapi working group's RateLimit header fields draft first defined unprefixed limit, remaining and reset headers, then replaced them with a single RateLimit structured field carrying limit, remaining and reset keys, alongside a RateLimit-Policy header describing the quotas.
As of 2026 it is still a draft, so production APIs use all three conventions and clients must parse defensively rather than assuming one. The detail implementers get wrong most often is reset, which is a delta in seconds in every version of the draft, not a Unix timestamp. Emitting a timestamp there makes well-behaved clients sleep for decades or not at all.
Source: https://datatracker.ietf.org/doc/draft-ietf-httpapi-ratelimit-headers/
rate-limitingapi-design
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