public FeedReaderErrorHandler(ModelStateDictionary modelState)
        {
            _httpStatusCode = HttpStatusCode.BadRequest;
            _errorinfo = new FeedReaderError(FeedReaderErrorType.InvalidRequest, "Request Validation Error");

            foreach (var state in modelState)
            {
                foreach (var error in state.Value.Errors)
                {
                    FeedReaderErrorCode errorCode = GetModelStateErrorCode(error.ErrorMessage);
                    _errorinfo.AddDetail(errorCode, error.ErrorMessage);
                }
            }
        }