public async Task <IActionResult> Append([FromBody] AppendReq req)
        {
            if (string.IsNullOrWhiteSpace(req.Key) || req.Value == null)
            {
                NotFound("Method Dictionary/Append params");
            }

            Logger.LogInformation($"Append dictionary key: {req.Key}, value: ${req.Value}");


            await _service.Append(req.Key, req.Value).ConfigureAwait(false);

            return(Ok());
        }