public IActionResult GetVideoCategories(string regionCode)
        {
            var cacheKey = "regionCode_" + regionCode.ToLower();

            if (!this.memoryCache.TryGetValue(cacheKey, out string videoCategories))
            {
                videoCategories = ytService.GetVideoCategories(regionCode);

                var chacheExpirationOptions = new MemoryCacheEntryOptions
                {
                    AbsoluteExpiration = DateTime.Now.AddHours(6),
                    Priority           = CacheItemPriority.Normal,
                    SlidingExpiration  = TimeSpan.FromMinutes(5)
                };
                this.memoryCache.Set(cacheKey, videoCategories, chacheExpirationOptions);
            }
            using (StreamReader stream = new StreamReader(HttpContext.Request.Body))
            {
                return(Ok(JsonConvert.DeserializeObject(videoCategories)));
            }
        }