Cache control with IIS and Cloudflare

Hi all,

I'm developing a MVC Rest API which will be deployed on IIS 10.

We will use Cloudflare as reverse proxy.

I want to use cache-control directives in Response Message Headers, but I have some doubts.

Directives will be used by both IIS and Cloudflare? (Example: static resources will be stored on both?)

If I implement ETag in my cache, how it will work?

Thank you

Nazza