Nginx + rewrite individual links

Question

Nginx

There is a site configured on nginx+php-fpm. Let's call it example.com It is

necessary to do rewrites at the nginx level so that all requests are not
http://example.com/admin
redirected to a secure protocol.
https://example.com/admin

The remaining sections of the site should continue to work on regular http, only /admin redirects

. Any advice would be appreciated.

Answer 1

location /admin {
   rewrite ^   https://example.com/admin permanent;
}

It?

Answer 2

Rewrite is not needed.

location /admin {
    return 301 https://example.com/$request_uri;
}