Bad request converting curl http request to Java

Question

I've the following request with curl that talks to Microsoft Azure services without a problem.

curl --request POST https://login.microsoftonline.com/common/oauth2/v2.0/token --data 'client_id=fe37...06-566f5c762ab2&grant_type=authorization_code&client_secret=tPv..dQfqomaG&scope=mail.read&code=OAQABAAIA...gAA'

Here is the java code that is throwing Bad Request exception:

 public String getToken(String authCode){

        try {

            HttpHeaders headers = new HttpHeaders();

            String url = "https://login.microsoftonline.com/common/oauth2/v2.0/token";
            UriComponentsBuilder builder = UriComponentsBuilder.fromHttpUrl(url);
            headers.add("client_id", "fe3..b2");
            headers.add("client_secret", "tP..aG");
            headers.add("grant_type", "authorization_code");
            headers.add("code", authCode);
            headers.add("scope", "mail.read");


            HttpEntity<?> entity = new HttpEntity<>(headers);
            RestTemplate restTemplate = new RestTemplate();

            HttpEntity<String> response = restTemplate.exchange(builder.build().toUri(), HttpMethod.POST, entity, String.class);


        }
        catch (Exception e){
            e.printStackTrace();
        }
        return null;

    }

I've also tried adding the --data section in to parameters object and I receive the same problem. I am using RestTemplate but I am open for other suggestions.

I appericiate your help.

Answer 1

I suppose that problem is that in curl example you pass these parameters inside POST body, while in your java code you use headers instead. Try change it to usage of body params of entity object:

MultiValueMap<String, String> body = new LinkedMultiValueMap<String, String>();     

body.add("client_id", "fe3..b2");
// ... rest params

// Note the body object as first parameter!
HttpEntity<?> entity = new HttpEntity<Object>(body, new HttpHeaders());