What is API Versioning in ASP.NET Web API?

Updated Apr 28, 2026

Short answer

API versioning allows evolving APIs without breaking clients.

Deep explanation

Versioning can be done via URL, query string, or headers to support backward compatibility.

Real-world example

Supporting old mobile apps with older APIs.

Common mistakes

  • Breaking existing clients.

Follow-up questions

  • What is backward compatibility?
  • Why version APIs?

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