static void ConfigureHubConnection(
IHubConnectionBuilder hubConnectionBuilder,
IServiceProvider serviceProvider)
{
var jsRuntime = serviceProvider.GetRequiredService <IJSRuntime>();
var navigationManager = serviceProvider.GetRequiredService <NavigationManager>();
hubConnectionBuilder.WithUrlBlazor(new Uri(DefaultHubUrl, UriKind.Relative), jsRuntime, navigationManager);
}