Spring RestTemplate POST Request with URL encoded data

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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);

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