Preventing redirection attacks for other domains (C #)

PreventingRedirectionAttacksForOtherDomains.cs

//Note: Before using these two functions read this
//https://docs.microsoft.com/pt-br/aspnet/mvc/overview/security/preventing-open-redirection-attacks

public static class PreventingRedirectionAttacksForOtherDomains
{
    public static bool CheckURLValid(string url)
    {
        return Uri.TryCreate(url, UriKind.Absolute, out Uri uriResult) && (uriResult.Scheme == Uri.UriSchemeHttp);
    }

    public static bool RedirectUrlIsValid(Controller controller, string redirectURL)
    {
        if (string.IsNullOrEmpty(redirectURL)) return true;

        if (controller.Url.IsLocalUrl(redirectURL)) return true;

        var domain = string.Empty;
        if (CheckURLValid(redirectURL))
            domain = new Uri(redirectURL).Host;

        return (controller.HttpContext.Request.Url.Host == domain);
    }

    public static void RedirectUrlIsValidException(Controller controller, string redirectURL)
    {
        if (!RedirectUrlIsValid(controller, redirectURL)) throw new UnauthorizedAccessException("URL redirects outside the application domain are not allowed!");
    }
}