Spring RestTemplate POST Request with URL encoded data

Question

I'm new to Spring and trying to do a rest request with RestTemplate. The Java code should do the same as below curl command:

curl --data "name=feature&color=#5843AD" --header "PRIVATE-TOKEN: xyz" "https://someserver.com/api/v3/projects/1/labels" 

But the server rejects the RestTemplate with a 400 Bad Request

RestTemplate restTemplate = new RestTemplate(); HttpHeaders headers = new HttpHeaders(); headers.add("PRIVATE-TOKEN", "xyz"); HttpEntity<String> entity = new HttpEntity<String>("name=feature&color=#5843AD", headers); ResponseEntity<LabelCreationResponse> response = restTemplate.exchange("https://someserver.com/api/v3/projects/1/labels", HttpMethod.POST, entity, LabelCreationResponse.class); 

Can somebody tell me what I'm doing wrong?

Answer 1

I think the problem is that when you try to send data to server didn't set the content type header which should be one of the two: "application/json" or "application/x-www-form-urlencoded" . In your case is: "application/x-www-form-urlencoded" based on your sample params (name and color). This header means "what type of data my client sends to server".

RestTemplate restTemplate = new RestTemplate();  HttpHeaders headers = new HttpHeaders(); headers.setContentType(MediaType.APPLICATION_FORM_URLENCODED); headers.add("PRIVATE-TOKEN", "xyz");  MultiValueMap<String, String> map = new LinkedMultiValueMap<>(); map.add("name","feature"); map.add("color","#5843AD");  HttpEntity<MultiValueMap<String, String>> entity = new HttpEntity<>(map, headers);  ResponseEntity<LabelCreationResponse> response =     restTemplate.exchange("https://foo/api/v3/projects/1/labels",                           HttpMethod.POST,                           entity,                           LabelCreationResponse.class);