Compare all 3
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| 429 + Retry-After | Reject, wait, retry | per retry | grows with each retry | HTTP | Low | Polite clients and API SDKs |
| Sliding Window | Requests in, oldest out | per request | count plus prune | timestamp log | Medium | Strict, exact quotas |
| Token Bucket | Tokens out, refill in | per request | one counter check | in-memory counter | Low | APIs that must allow bursts |