where do I send a network requests? And what do you mean by “send user agent"?
I guess this refers to the changes in the latest preview release? This is an internal change and not about a user facing feature.
If you are interested in details: network requests refers to the app fetching data over the network, actually the internet, from services like TMDB and Trakt. When doing this the app sends a “user agent” which identifies the app against those services, it’s just the name of the app and its version.