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In this replay of an internal Vaadin Learn session, Leif Åstrand explains in detail how Vaadin Flow works.
0:00 - Intro
0:16 - What happens when you press a button?
1:04 - The example application
1:43 - 3 levels of abstraction
3:11 - Initial request
4:26 - Bootstrap page
5:29 - Delegating to the server
7:13 - ClientCallable handling
9:05 - Initial render
9:20 - What happens when you click a button? Event RPC
11:12 - Element view
12:18 - How components map to elements
14:09 - Event handler registration
16:17 - State node view
21:52 - Server-client communication (node changes)
23:23 - Summary
25:08 - Uploads and other special cases