foo(Uri? iProxyUri, NetworkCredential iProxyCredentials){
       CredentialCache cache = [];
       
       _ = cache.TryAdd(iProxyUri, iProxyCredentials);
        
         HttpClientHandler handler = new()
        {
            AllowAutoRedirect = false, // we want to handle the redirect 
            ServerCertificateCustomValidationCallback = (iRequest,
                                                         _1,
                                                         _2,
                                                         iErrors) => true,
            Proxy = new WebProxy(iProxyUri, false)
            {
                Credentials = iProxyCredentials,
                UseDefaultCredentials = false
            },
            SslProtocols = MySslProtocol,
            UseProxy = true,
            DefaultProxyCredentials = cache,
            Credentials = cache,
            UseDefaultCredentials = false,
            // PreAuthenticate = true
        };
        using HttpClient client = new(handler)
        {
            Timeout = TimeSpan.FromMinutes(5)
        };
}