server-configs-nginx/sites-available/no-default

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# Drop requests for unknown hosts
#
# If no default server is defined, nginx will use the first found server.
# To prevent host header attacks, or other potential problems when an unknown
# servername is used in a request, it's recommended to drop the request
# returning 444 "no response".
server {
listen [::]:80 default_server deferred;
return 444;
}