javascript - Multipart request does not work -

this have, put different blogs trying describe how multipart request in angular. however, not work. says bad request (400). wrong? because miss content-type beneath content-disposition header? how add if case?

        var fd = new formdata();         fd.append('data', server);          return $http.post('/servers', fd, {             transformrequest: angular.identity,             headers: {                 'content-type': undefined             }         }); 

request payload chrome

------webkitformboundaryowougkw6gayclwsb content-disposition: form-data; name="data"  {"status":"rejected","description":"test"} ------webkitformboundaryowougkw6gayclwsb--