Hey Aparsons, thanks for your feedback. As mentioned in the post, the Handbook is not finished and we'll continue to evolve, adding more chapters, meat to the current chapters, and we have other ideas like exercises.
It's good that you are interested in Scaling WebSockets, because that is the chapter I am writing now! I hope to get it live in a couple of weeks, once it is I can send you the new version.
Finally, after 60 pages of docs I can Google, there’s a section called “Scaling Websockets”, which is an interesting and challenging topic.
Turns out it’s one paragraph long, saying - “Yeah it’s hard. You should consider using Ably. Next book will cover it.”
Shameful.