howto create conditional basic authentication

[Paul Swielingen]

Hi all,

I have an operational NGINX server with e few dozen location {}
definitions

When a connection is made from an internal network towards the server
the client browser gets all the pages. Now I like to add external
access, but I need to require basic authentication. Can this be done
without duplication of these few dozen location {} definitions or ???

Hope anybody can help me out.
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