nginx re-resolve upstream dns

gistfile1.txt

  # nginx will only re-resolve a hostname for a proxy if it's a variable
  set $feedback "FEEDBACK";
  resolver RESOLVER; # set from $(grep nameserver /etc/resolv.conf | head -1 | awk '{ print $2; }')

  location / {
    proxy_pass http://$feedback;
    proxy_set_header Host $http_host;
    proxy_set_header X-Forwarded-Proto $scheme;
    proxy_set_header X-Forwarded-Ssl on;
    proxy_redirect off;
  }