Spring boot RestClient post for object without request body results in bad request

user_7505487 0
Viewed 12443

I am trying to make a restTemplate.postForObject() without the request body and i am getting bad request.

HttpHeaders headers = new HttpHeaders();
      headers.set(HttpHeaders.AUTHORIZATION, "Bearer " + accessToken);
      headers.setAccept(Collections.singletonList(MediaType.APPLICATION_JSON));
      HttpEntity<String> entity = new HttpEntity<>(headers);

      CurrentAccount account = client.postForObject(
          "https://api.dropboxapi.com/2/users/get_current_account", entity, CurrentAccount.class);

error

Caused by: org.springframework.web.client.HttpClientErrorException$BadRequest: 400 Bad Request: [Error in call to API function "users/get_current_account": Bad HTTP "Content-Type" header: "application/x-www-form-urlencoded".  Expecting one of "application/json", "application/json; charset=utf-8", "text/plain; charset=dropbox-cors-hack".]

On adding 

 headers.setContentType(MediaType.APPLICATION_JSON);

I get an error 

Caused by: org.springframework.web.client.HttpClientErrorException$BadRequest: 400 Bad Request: [Error in call to API function "users/get_current_account": request body: could not decode input as JSON]

postman request works without body

resttemplate spring-boot rest
3 Answers

You should also specify request body as string text "null". Yes, Dropbox Api is stating that is not required to send body when issuing POST request, but it is error somewhere between how Dropbox expecting empty JSON body representation and how spring rest template is sending the empty body JSON representation, in POST request

user_72771570

The error message is pretty self-explanatory. You already set Accept but you didn't set Content-Type

Add following to your headers

import org.springframework.http.MediaType;

...

headers.setContentType(MediaType.APPLICATION_JSON);
user_81927190

You can use org.json.JSONObject as an empty request body:

restTemplate.postForEntity(
            "http://<yoururl>.com",
            new org.json.JSONObject(), <YourResponseType>.class).getBody();

especially if you want that the route returns something, in which case the "null" request body would not work.

user_18694550
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