I’m sorry as I can’t answer you as I still don’t understand the question 
I know what a user agent is, and I only have very basic knowledge about CDN, and know pretty much nothing about proxying or stuff like this.
Are you referring to Discourse or Bunny’s configuration? In either case, I didn’t do anything with settings related to some user agents. My forum is a standard install with no fancy stuff, and my Bunny configuration is very standard as well.
I can show you my general configuration in Bunny:
