I would like to have all HTTP requests made to my production environment be also automatically made against my testing environment. E.g. if anything makes a request to http://production.site.example.com/api/users/12345
then I want the same request to also be made against http://staging.site.example.com/api/users/12345
by some internal entity that sees the first request.
Is there an easy way to set this up in IIS without having to create a custom module or similar? If not, what is the best approach to take when creating such a module, so this does not cause any extra load on the production instance of my app?