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What status code should I set for UPDATE (PUT) and DELETE (e.g. product successfully updated)?
481
If you DELETE something that doesn't exist, you should just return a 204 (even if the resource never existed). The client wanted the resource gone and it is gone. Returning a 404 is exposing internal processing that is unimportant to the client and will result in an unnecessary error condition.
UPDATE. An update can be implemented with an HTTP PUT or PATCH method. The difference lies in the amount of data the client has to send to the backend. 200 OK - This is the most appropriate code for most use-cases.
The HTTP 204 No Content success status response code indicates that a request has succeeded, but that the client doesn't need to navigate away from its current page.
The 200 status code is by far the most common returned. It means, simply, that the request was received and understood and is being processed. A 201 status code indicates that a request was successful and as a result, a resource has been created (for example a new page).
For a PUT request: HTTP 200, HTTP 204 should imply "resource updated successfully". HTTP 201 if the PUT request created a new resource.
For a DELETE request: HTTP 200 or HTTP 204 should imply "resource deleted successfully".
HTTP 202 can also be returned by either operation and would imply that the instruction was accepted by the server, but not fully applied yet. It's possible that the operation fails later, so the client shouldn't fully assume that it was success.
A client that receives a status code it doesn't recognize, but it's starting with 2 should treat it as a 200 OK.
PUT
If an existing resource is modified, either the 200 (OK) or 204 (No Content) response codes SHOULD be sent to indicate successful completion of the request.
DELETE
A successful response SHOULD be 200 (OK) if the response includes an entity describing the status, 202 (Accepted) if the action has not yet been enacted, or 204 (No Content) if the action has been enacted but the response does not include an entity.
Source: W3.org: HTTP/1.1 Method Definitions
HTTP 200 OK: Standard response for successful HTTP requests. The actual response will depend on the request method used.
HTTP 204 No Content: The server successfully processed the request, but is not returning any content
Source: List of HTTP status codes: 2xx Success
200
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