A Spring Boot–based API Rate Limiter that protects APIs from overuse by controlling request flow per user/IP using Redis caching.
Ensures fair usage, stability, and protection of APIs with smart request throttling.

• ⚡ Request Throttling → Limit requests per user/IP (e.g., 100 requests per minute).
• 🔄 Auto Reset Counters → Limits reset every minute automatically.
• 🛡 API Protection → Prevents abuse & ensures fair resource usage.
• 📡 Redis Powered → High-performance caching for request counts.
• 🧩 Plug & Play → Works with embedded Redis, no external setup needed.

1. 🌐 Public APIs (Prevent Abuse)
2. 🔑 Authentication endpoints
3. 💳 Payment gateways
4. 💬 Messaging systems

flowchart TD
    A[Client Request] --> B[RateLimiterFilter]
    B -->|Check User/IP| C[RateLimiterService]
    C -->|Request Count in Redis| D[Redis Store]
    C -->|Allowed| E[API Controller]
    C -->|Blocked| F[429 Too Many Requests]
    E --> G[✅ Success Response]
    F --> H[❌ Error Response]