Sinatra: Up and running!

What a fantastic Christmas present.
My copy finally arrived Dec 24th.
I read it immediately.
And loved it.
Clear concise examples, with a nice touch of humour.
Having trouble locating the examples online, but that's no real issue.
Had a few 'wait. what?' moments though.
I tend to think that most of those were caused by my lack of deep knowledge of Rack.
You know the feeling where a conversation goes like this:

"So you can see that 2 + 2 = 4, right?"
"yup"
"So now we show what's going on behind that statement"
"ok"
"So here we have the Calibi-Yau moduli space and by increasing one dimension we can build a box girder bridge"
"wait. what?"

All in all, I have to patient before I get to examining the details as I primarily concerned with having small Restful APIs running out of an executable war (Jetty8).
I'll get there.