if (!path.StartsWith("/oauth/", StringComparison.Ordinal)
    && !path.StartsWith("/signin", StringComparison.Ordinal)
    && !path.StartsWith("/signup", StringComparison.Ordinal)
    && !path.StartsWith("/setup/phone", StringComparison.Ordinal)
    && !path.StartsWith("/setup/confirm", StringComparison.Ordinal))
{
   throw new Exception($"ended up at {path}");
}

// yet I get 'ended up at /setup/confirm' in the crash reports; path comes from a WebView URL