Which http library trpc uses in the frontend?

I was wondering if

trpc

trpc

uses the

Fetch API

Fetch API

Fetch API

Fetch API or uses something like

Axios

Axios

Axios

Axios to do API calls from the frontend. I recently added

supertokens

supertokens

supertokens

supertokens to an app and I need to add a middleware for session refreshment depending on the tool I'd be using