How to write nginx rules correctly?

Question

Nginx

Tell me how to properly deny access to the entire folder, subfolders and files except for one subfolder.
That is, for example, there is a directory: /folder
There are many folders in it, including the /allow folder.
Access to /folder and all subdirectories except /allow must be denied.

Answer 1

Try to make the maximum match.
Something like this:

location /folder { deny all; }
location /folder/allow { allow all; }