Thanks, Andrey, for the update. I hope you can share the whitelist on the SageCell home page so that I can link to it from the Notebook Player.

To keep the current pages of me and my collaborators alive, access to subpages of the following two URLs would be needed. https://opendata.ecdc.europa.eu/ (European Centre for Disease Prevention and Control)
https://opendata.dwd.de (Data from the German Weather Service).

But besides accessing these "official" data sources, restricting Internet access gives me yet another problem I am not sure how to solve:

Cells in some of my pages load a Python script from my server at https://mathtrek.eu, which defines some functions. I could put this code directly into some cell, but I'd rather like to hide it from the visitor for the following reason.

I am encouraging the visitor to play around with the code in the SageCells of the page, thus modifying my data analysis. I do not assume that the visitor has experience with Sage but I hope to encourage her in this way to have a closer look at it. Revealing more complex code, she shouldn't tamper with, contradicts this - I am ready to do it, if it is the only way to keep the pages alive, but it doesn't make me happy.

Thanks for pointing me to the SageCell EVM, I'll have a look at it.

Best wishes
Ingo

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