nginx log in /var/log/nginx/error.log
shows intereseting Error 13: Permission denied:
2017/11/14 00:33:30 [crit] 5117#5117: *224 open() "/var/lib/nginx/proxy/3/02/0000000023" failed (13: Permission denied) while reading upstream, client: 93.136.115.2, server: git.domain.tld, request: "GET /css/semantic-2.2.10.min.css HTTP/1.1", upstream: "http://127.0.0.1:3000/css/semantic-2.2.10.min.css", host: "git.domain.tld"