public IHttpActionResult GetIsLeader(int?groupId = null) { return(Authorized(token => { try { bool isLeader = _serveService.GetIsLeader(token, groupId); return Ok(new { isLeader = isLeader }); } catch (Exception ex) { var apiError = new ApiErrorDto("Get Is Leader failed", ex); throw new HttpResponseException(apiError.HttpResponseMessage); } })); }