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The IETF draft for standardizing HTTP RateLimit headers can work with any rate limiting algorithm, not just quota-reset approaches. Linear algorithms like GCRA (Generic Cell Rate Algorithm) encourage smoother client behavior by dynamically shrinking the effective window during bursts, unlike quota-reset or sliding-window algorithms that promote cyclic burst-pause patterns. The article provides a detailed implementation of GCRA adapted for RateLimit headers, explaining how to calculate the available quota and effective window using a simple "not-before" timestamp per client. This approach uses less memory and simpler code while naturally smoothing request intervals.

HTTP RateLimit headers – Tony Finch