anchor.diff:        sslCertificateKey = "/var/lib/acme/${vhostName}/key.pem";
       })
     ) cfg.virtualHosts;
  +  enableIPv6 = config.networking.enableIPv6;
   
     configFile = pkgs.writeText "nginx.conf" ''
       user ${cfg.user} ${cfg.group};
  
positive.code:       ${optionalString cfg.statusPage ''
          server {
            listen 80;
            listen [::]:80;
  
            server_name localhost;
  
  
negative.code: 
          server {
            listen ${listenString};
            ${optionalString enableIPv6 "listen [::]:${listenString};"}
  
            server_name ${serverName} ${concatStringsSep " " vhost.serverAliases};
            ${acmeLocation}
  