Error AtlasError Documentation and Resolution

HTTP 412 Precondition Failed

412 Precondition Failed

The server rejected the request because one or more conditions defined by conditional request headers evaluated to false.

412 Precondition Failedgeneral
412 Precondition Failed
  • The request included conditional headers such as If-Match or If-Unmodified-Since that no longer match the resource state.
  • The client is attempting to update a stale version of a resource.
  • Caching or optimistic concurrency controls are using outdated ETag or timestamp values.
  1. Fetch the latest representation of the resource and retry with current conditional values.
  2. Review If-Match, If-None-Match, and related headers for stale ETag or timestamp usage.
  3. Make sure optimistic concurrency logic refreshes resource state before issuing updates.
MDN: 412 Precondition Failed
412 Precondition Failed: what it means and how to fix it | Error Atlas