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 502 Bad Gateway
A proxy or gateway received an invalid response from the upstream server.
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- Code
502- Name
- Bad Gateway
- Category
- 5xx — Server error
How to fix / what to check
The app behind the proxy is down or crashing. Check php-fpm / app container status and the upstream address (socket path or port) in the nginx config.