I wonder how one does this on nodejs across instances gracefully.

I remember implementing the same thing in our framework like a decade ago, but eventually taking it out. We wanted to use it for caching data between tabs, so as not to hit the server again per tab:

https://github.com/Qbix/Platform/blob/main/platform/plugins/...

It had the concept of a “main frame” that they would route all requests to the server through.

I remember now — I did it not so much for tabs as for our solution of having tons of little iframes on a page: https://qbix.com/ecosystem

[dead]