@callback build(
  Finch.Request.method(),
  Finch.Request.url(),
  Finch.Request.headers(),
  Finch.Request.body(),
  Keyword.t()
) :: Finch.Request.t()

@callback request(Finch.Request.t(), module(), keyword()) ::
  {:ok, Finch.Response.t()} | {:error, Exception.t()}