IOS: User Settings Service (pmapi/usersettings) always returns HTTP 400

Though HTTP body has content, the IOS user setting service returns HTTP 400.

Request Detail

• URL: http://pmapi/usersettings/name

• Method: POST

• Content-Type: text/plain

• Body: Siri

Error log: 2019-02-06 12:04:37.643425+0530 mobentios[273:12086] [Error] UserSettings Service POST No HTTP Body

Sample AngularJS request code used to consume the service:

 var request = {
     "method": "POST",
     "url": "http://pmapi/usersettings/name",
       "headers": {
         'content-type': 'text/plain'
       },
     "data": "Siri"
 };
 $http(request);

Please note that the above request worked fine for Android and Windows (Java).