SDI: URL shortening

Q: Design TinyURL or bitly (a URL shortening service)

Given a (typically) long URL, how would how would you design service that would generate a shorter and unique alias for it.

Discuss things like:

  • How to generate a unique ID for each URL?
  • How would you generate unique IDs at scale (thousands of URL shortening requests coming every second)?
  • How would your service handle redirects?
  • How would you support custom short URLs?
  • How to delete expired URLs etc?
  • How to track click stats?

https://www.interviewbit.com/problems/design-url-shortener/ is a long discussion.

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