Nginx: Set the file type in Vim.

nginx/snippets/websockets.conf

+# vim: ft=nginx
 proxy_set_header    Upgrade $http_upgrade;
 proxy_set_header    Connection "Upgrade";
 proxy_read_timeout  36000s;

nginx/snippets/www-acme-challenge.conf

+# vim: ft=nginx
 location /.well-known/acme-challenge/ { root /var/www/www.shore.co.il; }