We were discussing anecdotal quotes from industry experts on gateway for object storage.
They cited gateways for object storage as provided by public cloud providers.  This is a convenience for using on - premise and cloud storage. which shows that there is value in this proposition. In addition, our approach is novel in using it for Content Distribution Network and by proposing it to be built into the object storage as  a service.
Some experts argued that gateway is practical only for small and medium businesses which are small scale in requirements. This means that they are stretched on large scale and object storage deployments are not necessarily restricted in size. These experts argued that the problem with gateway is that it adds more complexity and limits performance.
When gateways solve problems where data does not have to move, they are very appealing to many usages across the companies that use cloud providers.  There have been several vendors in their race to find this niche. In our case, the http references to use copies of objects versus the same object is a way to do just that.  With object storage not requiring any maintenance or administration and providing ability to store as much content as necessary, this gateway service becomes useful for content distribution network purposes.
Some experts commented that public cloud storage gateways are able to mirror volume to a cloud but they are still just building blocks in the cloud. They do not scale capacity or share data to multiple locations This is exactly what we try to do with a gateway from object storage.
A gateway is supposed to distribute the traffic. If it sends it to the same single point of contention, it is not very useful When requests are served from separate caches, the performance generally improves over what might have been incurred in going to the backend. That is why different proxy servers behind a gateway could maintain their own cache.  A dedicated cache service like AppFabric may also be sufficient to handle requests. In this case, we are consolidating proxy server caches with a dedicated cache. This does not necessarily mean a single point of contention. Shared services may offer at par service level agreement as an individual service for requests. Since a gateway will not see a performance degradation when sending to a proxy server or a shared dedicated cache, it works in both these cases. Replacing a shared dedicated cache with a shared dedicated storage such as an Object Storage is therefore also a practical option.
#codingexercise
print all the combinations of a string in sorted order
void PrintSortedCombinations(String a)
{
  a.Sort();
  PrintCombinations(a);
  // uses the Combine() method implemented earlier
}