Rest API - HTTP Status Codes
You are designing a REST API for editing documents. To prevent update conflicts, you decide to use the 409 Conflict status. Which approach best uses 409 to handle concurrent edits?
You are designing a REST API for editing documents. To prevent update conflicts, you decide to use the 409 Conflict status. Which approach best uses 409 to handle concurrent edits?
hard📝 Application Q15 of 15
Step-by-Step Solution
Solution:
Step 1: Understand concurrency control with 409
Using version numbers lets server detect if data changed since client last fetched it.Step 2: Choose approach that uses 409 properly
Require clients to send a version number with updates; if it doesn't match server's current version, respond with 409 and conflict details. uses version check and returns 409 only on real conflicts with details.Final Answer:
Require clients to send a version number with updates; if it doesn't match server's current version, respond with 409 and conflict details. -> Option BQuick Check:
Version check + 409 Conflict = best concurrency control [OK]
Quick Trick: Use version numbers and 409 to handle concurrent edits safely [OK]
Common Mistakes:
- Overwriting data blindly without conflict checks
- Returning 409 for every update request
- Ignoring versioning and conflicts
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