How can you combine optimistic concurrency control with 409 Conflict responses in a REST API to prevent lost updates?

hard📝 Application Q9 of 15

Rest API - HTTP Status Codes

AAlways accept updates and overwrite existing data.

BCheck resource version on update; if mismatch, return 409 Conflict to client.

CUse 500 Internal Server Error when versions mismatch.

DIgnore versioning and rely on client retries.

Step-by-Step Solution

Solution:

Step 1: Understand optimistic concurrency control
This method checks the resource version before updating to avoid overwriting changes.
Step 2: Return 409 Conflict on version mismatch
If the client's version is outdated, the API returns 409 Conflict to notify the client.
Final Answer:
Check resource version on update; if mismatch, return 409 Conflict to client. -> Option B
Quick Check:
Optimistic concurrency + 409 Conflict prevents lost updates [OK]

Quick Trick: Use version checks and 409 to avoid lost updates [OK]

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