getDocument method
Gets information about a specific Document.
Throws a http.ClientException if there were problems communicating with
the API service. Throws a ServiceException if the API method failed for
any reason.
Implementation
Future<Document> getDocument(GetDocumentRequest request) async {
final url = Uri.https(_host, '/v1beta/${request.name}');
final response = await _client.get(url);
return Document.fromJson(response);
}