I'm pretty new to this and just learned some more about routing requests in a cloud service at scale. For a lot of services where the location of the resources

I'm pretty new to this and just learned some more about routing requests in a cloud service at scale. For a lot of services where the location of the resources might change (frequently sometimes), you want to handle the routing internally and not use DNS because of the lag times and complexity of TTL and caching. For companies other than Wix I don't know what is used to handle it on the back end but I imagine it's either some specialized piece of hardware than can handle an insane load or some commodity hardware / cloud service & in-house software like here. At the end of the day, and I'm sure I'm missing some edge cases, I think it's basically a service that provides a mapping of domain.com/user-resource-or-website to the location of their resources with no lag time when changes are made.