Can't catch exception occur during goaway frame

Hello! Thanks for the lib). I ran into the following problem. When server send me goaway frame, StreamHandler class create following exception:

`StreamException(
id,
'Remote end was telling us to stop. This stream was not processed '
'and can therefore be retried (on a new connection).')`

This StreamException class is not provide outside the http2 lib. I can check this exception only if i directly import it:

`import 'package:http2/src/sync_errors.dart'`

But it is not cool providing class this way)
Maybe there is an any other way to check server send me goaway frame?