Spring RestTemplate Post with Header

String pause_msg = "{\n" +
"  \"paused\": true\n" +
"}";
String start_msg = "{\n" +
"  \"paused\": false\n" +
"}";
String url = alertDto.getUrl() + "/" + alertDto.getId() + "/pause";
HttpHeaders headers = new HttpHeaders();
headers.setAccept(Collections.singletonList(MediaType.APPLICATION_JSON));
headers.add("Authorization", alertDto.getBearer());
headers.add("Content-Type", "application/json");
HttpEntity<String> entity = new HttpEntity<String>(pause_msg, headers);
Object responses = restTemplate.exchange(url, HttpMethod.POST, entity, Object.class);