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FREE · TOPIC 184

Rate Limiter Placement And Keys

514 words·Updated 2026-07-18·

#system-design#rate-limiting#api-gateway#abuse-prevention

Accompanying Lab

Sliding Window Rate Limiter

An in-memory limiter that stores recent request timestamps per key and computes allow, remaining, and retry-after decisions.

Primary References & Engineering Sources

·[[wiki/arpit-algorithmic-system-design-i]]
·https://docs.nginx.com/nginx/admin-guide/security-controls/controlling-access-proxied-http/
·https://docs.github.com/en/rest/using-the-rest-api/rate-limits-for-the-rest-api
·https://www.rfc-editor.org/rfc/rfc6585

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