HTTP redirect

301 redirect

• the requested URL is "permanently" moved to the long URL.
• Since permanent, the browser caches the response, and the subsequent request are send to the redirected site directly
  • (To the long URL instead of the short URL)
• To reduce server load

302 redirect

• "temporary redirect"
• every new request are still sent to the URL shortening services first
• Can be used for analytics, tracking click rate and source of the click