if ($host ~* www(.*)) {
set $host_without_www $1;
}
header_filter_by_lua '
ngx.header["Set-Cookie"] = "value=1; path=/; domain=$host_without_www; Expires=" .. ngx.cookie_time(ngx.time()+2592000) -- +1 month 30 days
';

So i added this to my config but does not work for me :(

http://www.networkflare.com/