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 499 Client Closed Request (nginx)
Non-standard nginx code: the client closed the connection before the server responded.
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- Code
499- Name
- Client Closed Request (nginx)
- Category
- 4xx — Client error
How to fix / what to check
The upstream was too slow and the client (or a load balancer) gave up. Find the slow endpoint and check timeouts in front of nginx.