There are two clusters.
There are two applications.
All requests first go to a primary app in one cluster.
If the primary app knows the request (non 404 http response code) it responds appropriately.
If the primary app doesn't know the request (404 http response code) it redirects the request the fallback secondary app running on a different cluster.
Is there a tool (e.g. service mesh) with which this scenario could be implemented and how?