location / {
            # allow for upstream to be offline by setting
            # docker dns resolver and a variable for the server
            resolver           127.0.0.11 valid=30s;
            proxy_pass         http://$upstream;

            proxy_redirect     off;
            proxy_set_header   Host $host;
            proxy_set_header   X-Real-IP $remote_addr;
            proxy_set_header   X-Forwarded-For $proxy_add_x_forwarded_for;
            proxy_set_header   X-Forwarded-Host $server_name;
            proxy_set_header   X-Forwarded-Upstream $upstream;
        }