Rate Limiter Module

A Rate Limiter Module throttles requests per IP/user to prevent abuse, DDoS, using token bucket or sliding window algos with Redis storage.

Enforces API quotas.

Implement Rate Limiting when:

• Public APIs.
• Abuse prevention.
• Fair usage.
• Cost control.

Note: 100 req/min default.

X-RateLimit headers.

Whitelist internals.