scheme.authenticate(credentials, (request, consumer) -> {

                // request header
                for (final Header header : requestHeaderList) {
                    request.addHeader(header);
                }

                HttpEntity httpEntity = null;
                try {
                    final HttpResponse response = closeableHttpClient.execute(request, new BasicHttpContext(httpClientContext));

				"application/rtf",
				"application/rtx",
				"application/samlassertion+xml",
				"application/samlmetadata+xml",
				"application/sbml+xml",
				"application/scvp-cv-request",
				"application/scvp-cv-response",
				"application/scvp-vp-request",
				"application/scvp-vp-response",
				"application/sdp",
				"application/set-payment",
				"application/set-payment-initiation",
				"application/set-registration",