[keycloak-user] How to correctly use REST API? delete user through REST API for example

Hi there, Can someone give me some hint about how to correctly setup a client that can accept REST request from a httpclient in keycloak? For example, I use the admin-access example from keycloak source project and modify it to do a DELETE action through REST API, however I keep getting the request Forbidden 403 from keycloak server. I don¹t change any setting of the admin-client imported from the json file and my code snippet of deleting user as below: public static void deleteUser(HttpServletRequest request, AccessTokenResponse res) throws Failure { HttpClient client = new DefaultHttpClient(); String userId = "e20277f8-2ebe-4e5e-aa00-0cee9c578249"; try { HttpDelete delete = new HttpDelete(getBaseUrl(request) + "/admin/realms/demo/users/" + userId); delete.addHeader("Authorization", "Bearer " + res.getToken()); HttpResponse response = client.execute(delete); System.out.println(response.getStatusLine().getReasonPhrase()); if (response.getStatusLine().getStatusCode() != 200) { throw new Failure(response.getStatusLine().getStatusCode()); } HttpEntity entity = response.getEntity(); InputStream is = entity.getContent(); if (is != null) is.close(); } catch (IOException e) { throw new RuntimeException(e); } finally { client.getConnectionManager().shutdown(); } }