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4xx · Client Error

409Conflict

The request conflicts with the current state of the server.

What is HTTP 409?

The 409 Conflict status indicates the request conflicts with the current state of the server. Common when trying to create a duplicate resource or when concurrent edits conflict.

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Common Use Cases

  • Duplicate username registration
  • Edit conflict (optimistic locking)
  • Version mismatch in APIs

Quick Facts

Code409
Category4xx
TypeClient Error

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