GRPCWebSignal constructor
Implementation
GRPCWebSignal(this._uri,
{List<int>? certificates, String? authority, String? password}) {
var uri = Uri.parse(_uri);
var channel = createChannel(uri.host, uri.port, uri.scheme == 'https');
_client = pb.RTCClient(channel);
_requestStream = StreamController<pb.Request>();
}