Why index in nginx is not available 403 Forbidden?

Question

System administration

In general, if you specify the path, then the redirect to index.php works. But if you just specify the domain, then the index document is not returned. You can see it here 188.120.245.244/home (domain name not purchased yet)
Here is the nginx config:
server {
listen 80 default_server;
listen [::]:80 default_server;
root /var/www/gotlib;
index index.html index.htm index.php index.nginx-debian.html;
server_name gotlib.info;
location / {
# First attempt to serve request as file, then
# as directory, then fall back to displaying a 404.
try_files $uri $uri/ /index.php;
index index.php;
}
location ~ \.php$ {
include snippets/fastcgi-php.conf;
# With php7.0-cgi alone:
​​#fastcgi_pass 127.0.0.1:9000;
# With php7.0-fpm:
fastcgi_pass unix:/run/php/php7.0-fpm.sock;
}
}