@scottalanmiller Sure! My minecraft plugin does this. Using the action:widgets.loaded hook for loading the initial data and appending it via jQuery using the data-widget selector, then I update the data using websockets and/or a setTimeout with an ajax call.
During the upgrade the following url is fetched: https://fonts.googleapis.com/css?family=Roboto:300,400,500,700
I was getting a 501 http error..
It was caused by the proxy, and solved by bypassing it.
The upgrade completed successfully.