HTTP 204 No Content vs 409 Conflict
HTTP 204 (No Content) is a 2xx Success response, while 409 (Conflict) is a 4xx Client Error response. 204 indicates that the server successfully processed the request but is not returning any content. Common for DELETE operations and form submissions that don't need a response body. In contrast, 409 means that the request conflicts with the current state of the server. Often due to concurrent modification or business rule violations.
Description
The server successfully processed the request but is not returning any content. Common for DELETE operations and form submissions that don't need a response body.
Quand vous le voyez
After DELETE requests, PUT updates where no body is needed, or CORS preflight responses.
Comment résoudre
No fix needed. The action was successful; there is simply no content to return.
Description
The request conflicts with the current state of the server. Often due to concurrent modification or business rule violations.
Quand vous le voyez
When trying to create a resource that already exists, or updating a resource that was modified by another request.
Comment résoudre
Refresh the resource state, resolve conflicts, and retry. Use ETags for optimistic concurrency.
Différences clés
204 is a 2xx Success response, while 409 is a 4xx Client Error response.
HTTP 204: The server successfully processed the request but is not returning any content. Common for DELETE operations and form submissions that don't need a response body.
HTTP 409: The request conflicts with the current state of the server. Often due to concurrent modification or business rule violations.
You encounter 204 when after DELETE requests, PUT updates where no body is needed, or CORS preflight responses.
You encounter 409 when when trying to create a resource that already exists, or updating a resource that was modified by another request.
Quand utiliser lequel
For 204 (No Content): No fix needed. The action was successful; there is simply no content to return. For 409 (Conflict): Refresh the resource state, resolve conflicts, and retry. Use ETags for optimistic concurrency.