xxxxxxxxxx
sudo tail -F /var/log/nginx/error.log
2022/05/03 13:35:31 [error] 791993#791993: *1 connect() failed (111: Connection refused) while connecting to upstream, client: ***.***.***.***, server: mydomain.com, request: "GET /api HTTP/1.1", upstream: "http://127.0.0.1:8080/api", host: "mydomain.com"