chromium phones home to google about stuff
nw.js binary occasionally shoots messages back to google servers for various purposes-- safe browsing blacklists, google apis, ipv6 pings, etc.
These need to be turned off at compile time. In the meantime, add the following to the manifest to keep these requests from leaving the local machine:
"chromium-args": "--proxy-server=http://127.0.0.1"
For testing purposes, change it to --proxy-server=http://127.0.0.1:4321 and set a listener with netcat or something to log the outgoing requests for a Purr Data session.