409
HTTP 409 Conflict
4xx Client Error
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4xx Client Error
RFC 7231, Section 6.5.8
What is HTTP 409 Conflict?
The 409 (Conflict) status code indicates that the request could not be completed due to a conflict with the current state of the target resource. This is commonly used in version control systems and collaborative editing applications where conflicts arise from concurrent modifications.
Common Use Cases
- Version conflict during resource update
- Editing a resource that has been modified by another user
- Duplicate entry creation attempt