D-Net

    private static final Logger logger = Logger.getLogger(HttpUtils.class);

    // TODO: To be changed the values

//    @Value("https://aai.openaire.eu/registry/")

    @Value("https://openaire-dev.aai-dev.grnet.gr/registry/")

        headers.setContentType(MediaType.APPLICATION_JSON);

        HttpEntity<String> request = new HttpEntity<>(body.toString(), headers);

        ResponseEntity<String> responseEntity = restTemplate.exchange(issuer + path, HttpMethod.POST, request, String.class);

            return new JsonParser().parse(responseEntity.getBody());

        } else {

            return null;

        headers.setContentType(MediaType.APPLICATION_JSON);

        HttpEntity<String> request = new HttpEntity<>(body.toString(), headers);

        ResponseEntity<String> responseEntity = restTemplate.exchange(issuer + path, HttpMethod.PUT, request, String.class);

            return new JsonParser().parse(responseEntity.getBody());

        } else {

            return null;

        String url = issuer + path + ((params != null) ? createParams(params) : null);

        ResponseEntity<String> responseEntity = restTemplate.exchange

                (url, HttpMethod.GET, new HttpEntity<>(createHeaders(user, password)), String.class);

            return new JsonParser().parse(responseEntity.getBody());

        } else {

            return null;

        String url = issuer + path;

        ResponseEntity<String> responseEntity = restTemplate.exchange

                (url, HttpMethod.DELETE, new HttpEntity<>(createHeaders(user, password)), String.class);

            return new JsonParser().parse(responseEntity.getBody());

        } else {

            return null;