error_page 418 = @nonwww;
set $nonwww "";
if ( $http_host ~* "^www\.") {
    set $nonwww "${nonwww}0";
}
if ( $nonwww ~* "^0+$" ) {
    return 418;
}
location @nonwww {
    rewrite ^ https://$tld$request_uri permanent;
}