foreach does not work

[Saint Michael]

I am using openresty
nginx -version
nginx version: openresty/1.21.4.1



>  foreach $domain in $server_name {
>>
>         ssl_certificate /etc/letsencrypt/live/$domain/fullchain.pem;
>         ssl_certificate_key /etc/letsencrypt/live/$domain/privkey.pem;
>     }
>
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