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 426 Upgrade Required
The client must switch to a different protocol.
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- Code
426- Name
- Upgrade Required
- Category
- 4xx — Client error
How to fix / what to check
Check the Upgrade header in the response (e.g. newer TLS or HTTP version).