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 414 URI Too Long
The URL is longer than the server will process.
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- Code
414- Name
- URI Too Long
- Category
- 4xx — Client error
How to fix / what to check
Move large parameters into a POST body. In nginx see large_client_header_buffers.