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 431 Request Header Fields Too Large
The headers are too large.
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- Code
431- Name
- Request Header Fields Too Large
- Category
- 4xx — Client error
How to fix / what to check
Usually too many or too large cookies. Clear cookies for the domain or reduce header size.