anchor.diff:  <% if fetch(:force_ssl, false) %>
   server {
     server_name <%= fetch(:server_name) %>;
  +  listen 80;
     listen [::]:80;
     ## redirect http to https ##
     rewrite ^ https://$server_name$request_uri? permanent;
  
positive.code: <% else %>
  server {
    server_name <%= fetch(:server_name) %>;
    listen [::]:80;
    passenger_enabled on;
    passenger_ruby /home/<%= fetch(:deploy_user) %>/.rbenv/shims/ruby;
  
negative.code: <% if fetch(:enable_ssl) %>
  server {
    server_name <%= fetch(:server_name) %>;
    listen 443;
    listen [::]:443;
    passenger_enabled on;
    passenger_ruby /home/<%= fetch(:deploy_user) %>/.rbenv/shims/ruby;
  