I am not sure wdym by "http client". But I'd keep the usage of "fetch" to minimum in the client side.

You want data? use server components
You want form submissions/button click? use server action
You want pagination, and search? use query params

If you want to use fetch in client side, just use the regular fetch, same as server side

You can also use react query

Which is the standard in react

And next

yeah, if you heavily depend on frontend fetching you should prolly use react query

but can I use react query on server side?

api client

handle requests using axios fetch or whatever for both server and clide side

You can check their docs

They explain how to cache server request into react query client side