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 101 Switching Protocols
The server is switching protocols as requested, e.g. upgrading to WebSocket.
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- Code
101- Name
- Switching Protocols
- Category
- 1xx — Informational
How to fix / what to check
Expected for WebSocket handshakes. If WebSockets fail behind a proxy, make sure the proxy forwards the Upgrade and Connection headers.