How nginx restricts illegal access to someone's area

Question

• For example, only users in Guangdong Province can open it
  All other regions will refuse connections

• What if I block access from a country, such as users from South Korea, I don’t want them to access this website.

Answer 1

There are two methods:
The first one is all implemented with nginx. First, you need to know the IP address rules of Guangdong Province, and then
location / {

if ( $query_string ~* 你的正则表达式匹配 ) {

  deny all;

}

............

Another way to implement in-program control, the general idea is similar

Answer 2

geoip module