Hi Rob,

The list is public, although not explicitly widely advertised, it is based 
on IP4 filtering:
https://github.com/sagemath/sagecell/blob/master/contrib/vm/compute_node/root/firewall

So far it seems to work, but depending on how things go in the future, it 
is possible that the only viable solution would be to shut down internet 
access completely. So the authors should not use external data without 
necessity. Of course, one can always start their own server, e.g. one 
behind a campus firewall, and do whatever they want there regarding 
outgoing access.

Feel free to point to the above script and let me know if you have any 
other questions!
Andrey

On Thursday, 17 March 2022 at 20:05:39 UTC-6 [email protected] 
wrote:

> Dear Andrey,
>
> I'm writing some documentation so that PreTeXt authors will better 
> understand 
> the Sage Cell Server - specifically that "extra" packages must be 
> installed at 
> the server and that getting at data files is limited. The hope is to 
> reduce the 
> support burden for you and for me. ;-)
>
> Question: which sites are on an allow-list for accessing files? I believe 
> Alex 
> Jordan has been able to open files hosted at GitHub repositories via the 
> URL for 
> "raw" files. Are there others? Is the list public? (e.g. Can I point to it 
> within a Sage Cell repo?)
>
> Any extra insight you can provide would be helpful. Once. ;-)
>
> Rob
>
>
>
>

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