namespace System.Net.Security
{
    public class SslStream : AuthenticatedStream
    {
        [SupportedOSPlatform("freebsd")]
        [SupportedOSPlatform("linux")]
        [SupportedOSPlatform("windows")]
        public virtual Task! NegotiateClientCertificateAsync(CancellationToken cancellationToken = default);
    }
}