Glossary term
What is 301 (301 Moved Permanently)?
301 stands for 301 Moved Permanently.
A permanent redirect that can be cached. Browsers may skip your server on later visits, so you lose analytics.
Learn it properly · Practical Design ProblemsLesson 1: Design a URL Shortener (Long URL to Short URL)Making IDs, Base62, collisions, caching for read-heavy traffic, 301 vs 302 and analytics, custom aliases, expiry and stopping abuse.