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726 B
726 B
Rate Limiting Principles
Protect your API from abuse and overload.
Why Rate Limit
Protect against:
├── Brute force attacks
├── Resource exhaustion
├── Cost overruns (if pay-per-use)
└── Unfair usage
Strategy Selection
| Type | How | When |
|---|---|---|
| Token bucket | Burst allowed, refills over time | Most APIs |
| Sliding window | Smooth distribution | Strict limits |
| Fixed window | Simple counters per window | Basic needs |
Response Headers
Include in headers:
├── X-RateLimit-Limit (max requests)
├── X-RateLimit-Remaining (requests left)
├── X-RateLimit-Reset (when limit resets)
└── Return 429 when exceeded