Redirect from http to https for feedback forms on nginx?

Question

Nginx

Hello.
There is a Debian + NGINX server without APACHE
It is necessary to implement a redirect from http to https on several pages.
Example:
www.site.com/admin -> https://www.site.com/admin/
and
www.site.com/feedback -> https://www.site.com/feedback/

Answer 1

I have done it this way, for several addresses you can try to do it through switch. And no regulars.

set $is_https 0;
if ($uri = /callback.php) {
    set $is_https 1;
}
if ($is_https = 1) {
   return 301 https://$host$request_uri;
}

Answer 2

There is no way to check, but I probably would have done this:
Added rewrite ^(.*) https://www.site.ru/admin$1 permanent to the main server;
I made a separate server in which everything for ssl is written, and the admin location is in it.
I'm not sure if this is correct, the first thing that came to mind.