public class AndroidCustomClientHandler : AndroidClientHandler
    {
        TLSSocketFactory _customTlsSSLSocketFactory = new TLSSocketFactory();

        protected override System.Threading.Tasks.Task SetupRequest(System.Net.Http.HttpRequestMessage request,
   					     Java.Net.HttpURLConnection conn)
        {
            SSLContext context = SSLContext.GetInstance("TLSv1.2");

            context.Init(null, null, null);
            SSLEngine engine = context.CreateSSLEngine();

            ((HttpsURLConnection)conn).SSLSocketFactory = _customTlsSSLSocketFactory;

            return base.SetupRequest(request, conn);
        }
    }