See the status code yourself
curl -sS -o /dev/null -w '%{http_code}\n' https://example.com/pathAdd -v to see the full request and response headers.
HTTP 412 Precondition Failed
A precondition in the request headers (e.g. If-Match) was not met.
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- Code
412- Name
- Precondition Failed
- Category
- 4xx — Client error
How to fix / what to check
The resource changed since you fetched it. Re-fetch and retry with the new ETag.