+
+ @spec format_host(String.t()) :: charlist()
+ def format_host(host) do
+ host_charlist = to_charlist(host)
+
+ case :inet.parse_address(host_charlist) do
+ {:error, :einval} ->
+ :idna.encode(host_charlist)
+
+ {:ok, _ip} ->
+ host_charlist
+ end
+ end