I'd pay at least 30$ for a book that does an analysis of the Flask's source code explaining the basics of the http protocol and restful apis.

For example, I use jsonp and I use a decorator from the Flask snippets (http://stackoverflow.com/questions/16134164/jquery-ajax-json...), however, I have no idea how this works and why jsonp is better than json...

Then I would like the book to link these learning to building secure and well tested web applications.

The reasons why I would pay for this are: 1. I would like to build a spreadsheets sharing app but I am very scared of handling sensible data if I don't know very well (by very well I mean the source code) my tech stack and also I know little about web security 2. I would like to contribute to Flask development one day (because it's cool, let' be honest) 3. It takes too much time for me to find out these things on my own and I would gladly pay for the time I save with a book