public void onRegistrationFailed(WitnessRegistration registration, Exception error) {
            log.error("Witness registration failed: {}", registration.getRegistrationId(), error);
        }

        @Override
        public void onRegistrationExpired(WitnessRegistration registration) {
            log.warn("Witness registration expired: {}", registration.getRegistrationId());

				"application/scvp-vp-request",
				"application/scvp-vp-response",
				"application/sdp",
				"application/set-payment",
				"application/set-payment-initiation",
				"application/set-registration",
				"application/set-registration-initiation",
				"application/sgml",
				"application/sgml-open-catalog",
				"application/shf+xml",
				"application/sieve",
				"application/simple-filter+xml",