Why it matters

Rate limits prevent abuse. Standard for production.

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The architecture

Token bucket or leaky bucket.

Redis for distributed state.

Rate limit designToken bucketrate + burstRedis statedistributedPer-user + per-tenantlayeredReturn HTTP 429 with Retry-After header
Rate limiting.
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How it works end to end

Per-user: prevent single user hogging.

Per-tenant: enterprise multi-tenancy.

Per-endpoint: expensive endpoints stricter.

Response: 429 with retry-after.