code: @Override
    public String secureProtocol()
    {
      SSLSocket sslSocket = _sslSocket;
      
      if (sslSocket == null) {
        return super.secureProtocol();
      }
      
      SSLSession sslSession = sslSocket.getSession();
      
      if (sslSession != null) {
        return sslSession.getProtocol();
      }
      else {
        return null;
      }
    }
docs: Returns the secure cipher algorithm.