Why this matters
Good limits protect shared backend resources without punishing normal users.
How to practice
Choose the limiting key that matches the expensive resource: IP, account, endpoint, job, or dependency.
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Learning objectives
- Match rate limits to the resource being protected.
- Distinguish per-IP, per-user, per-account, cost-based, and concurrency limits.
- Use Retry-After, backoff, jitter, and circuit breakers to reduce overload.
- Compare routing strategies under changing server capacity.
- Understand overload, latency, and health-aware routing.
- Connect horizontal scaling to practical traffic distribution.
Common mistakes to avoid
- Using only per-IP limits for authenticated or account-level abuse.
- Applying the same raw request limit to cheap and expensive operations.
- Relying on client-side debounce as the only protection.
- Letting retries synchronize into a retry storm.
- Treating all servers as equal when they have different capacity.
- Ignoring server health during traffic spikes.
Games for Rate Limiting & Backpressure
Start with the first game, then use local review history to revisit missed decisions.
Scaling Intermediate
Choose rate limiting designs for realistic backend traffic patterns, from public APIs and login endpoints to queues, webhooks, and retry storms.
- Time
- 6-9 minutes
- Concept
- Rate limiting, fairness, backpressure, and abuse protection
- Data & Performance
- Rate limiting
- Scaling
- 429
Play Rate Limit Architect Scaling Intermediate
Route simulated traffic across backend servers using round robin, weighted round robin, least connections, and random strategies.
- Time
- 6-10 minutes
- Concept
- Load balancing strategies
- Production Reliability
- load balancing
- scaling
- latency
Play Load Balancer Challenge APIs Intermediate
Investigate webhook requests and choose safe handling for signatures, replay windows, retries, idempotency, and durable acknowledgement.
- Time
- 6-9 minutes
- Concept
- Webhook verification, replay protection, idempotency, and retry-safe processing
- Foundations
- webhooks
- HMAC
- idempotency
Play Webhook Signature Forensics