How to configure nginx so that all non-existent kjkfdgkj.site.com are reverted to site.com?

Question

Nginx

kjkfdgkj.site.com reverted to site.com
or led to 404
but static.site.com remained static.site.com

Answer 1

# главный сайт
server {
  listen 80;
  server_name site.com;
  ...
}

# статика
server {
  listen 80;
  server_name static.site.com;
  ...
}

# всё остальное
server {
  listen 80 default_server;
  # редирект на site.com
  return 301 http://site.com;
  # или 404
  #return 404;
}