Protect servers from overload, enhance stability and strength security by preventing malicious attack (DDoS)
- User based: limit the number of creating short url by user
- IP based: limit the number of resolving url by IP (DDoS)
- Token bucket algorithm: easy to implement, enable handle steady traffic and traffic spike
- 429 Too Many Requests: block or delay requests
- Redis: count request using
INCR, reset count usingEXPIRE