api concurrency_error ai_generated true

412 Precondition Failed: ETag mismatch

ID: api/etag-precondition-failed

Also available as: JSON · Markdown
82%Fix Rate
86%Confidence
3Evidence
2023-01-01First Seen

Version Compatibility

VersionStatusIntroducedDeprecatedNotes
any active — — —

Root Cause

Optimistic concurrency check failed: resource modified.

generic

Workarounds

  1. 90% success Fetch latest version, merge changes, retry with new ETag
  2. 85% success Show conflict to user for manual resolution

Dead Ends

Common approaches that don't work:

  1. Remove ETag checks 82% fail

    Lost updates

  2. Force overwrite with If-Match: * 78% fail

    Same as no concurrency control