That is only checking if the Internet connection/db connection exists.
That could be done by every web app (web2py or otherwise).
That is not the definition of a PWA.
>From wikipedia
"
Progressive web applications (PWAs) are web applications that load like regular 
web pages or websites but can offer the user functionality such as working 
offline, push notifications, and device hardware access traditionally available 
only to native applications. PWAs combine the flexibility of the web with the 
experience of a native application.
"

Showing an error message is not the same as working offline (which requires an 
embedded server as I mentioned in the previous message) and the same goes to 
the hardware access.

-- 
Resources:
- http://web2py.com
- http://web2py.com/book (Documentation)
- http://github.com/web2py/web2py (Source code)
- https://code.google.com/p/web2py/issues/list (Report Issues)
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