Setting request header content-type to json in Spring Framework resttemplate [duplicate]

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you can try using any method from below code

1

HttpHeaders headers = new HttpHeaders();
headers.setContentType(MediaType.APPLICATION_JSON);

HttpEntity<String> entity = new HttpEntity<String>(postBodyJson ,headers);
restTemplate.put(uRL, entity);

2

RequestEntity<String> requestEntity = RequestEntity .post(new URL(attributeLookupUrl).toURI()) .contentType(MediaType.APPLICATION_JSON) .body(postBodyJson); 
restTemplate.exchange(requestEntity, responseClass);

3

HttpHeaders headers = new HttpHeaders();
headers.setContentType(MediaType.APPLICATION_FORM_URLENCODED);

// if you need to pass form parameters in request with headers.
MultiValueMap<String, String> map = new LinkedMultiValueMap<>();
map.add("username", userName);
map.add("password", password);

HttpEntity<MultiValueMap<String, String>> request = new HttpEntity<>(map, headers);
ResponseEntity<TokenVO> responses = restTemplate.postForEntity(URL, request, responseClass);

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