Where is source code for the 'packages_dynamic' endpoint?

[rswgnu]

I want to see how you handle dynamic loading in your 1 million rows example but the code has a url parameter of: "https://docs.webix.com/samples/server/packages_dynamic" which serves up the data on request. However, on looking through the samples code, even under the php subdirectory, I don't see any packages_dynamic code source. Please point me to it.

The sample I am referring to is discussed here:
https://blog.webix.com/webix-grid-1-000-000-rows-and-more/

It would be incredibly helpful if you made a standalone, runnable sample from this with all parts of the source code exposed for viewing in a JSFiddle.