Snapcraft CDN down? How to detect in advance?

at least parts of snapcraftcontent dot com seem to be down, I have successfully installed core20 and snapd, but for lxd it says:

snap install lxd

error: cannot perform the following tasks:

No big deal (I hope, unless it takes too long to resolve), but is there any way to do a kind of a “smoke test” to detect something like this without actually trying to install or upgrade something? In my case this is part of a somewhat complicated physical server reinstall with many moving parts that I would not like to start unless I’m fairly certain it will go smoothly, so I have a sort of pre-flight check, e.g. for RHEL I curl, etc.

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