RSS feeds on onion services don't work anymore

[BlauerHunger]

My nextcloud instance is in a network that resolves Tor onion services through a transparent proxy. Up until a few weeks ago, the RSS feeds on onion services I have in my news app, worked flawlessly with this setup. Then, suddenly they stopped updating, breaking my use case for this app.
When hovering over one of the feeds in question, I get a message saying "cURL error 6: Not resolving .onion address (RFC 7686)".

One feed this is happening with is the feed for the Tor project blog: http://pzhdfe7jraknpj2qgu5cz2u3i4deuyfwmonvzu5i3nyw4t4bmg7o5pad.onion/feed

Since I don't want to use multiple feed aggregators for different feeds, I'm seriously considering switching to a different tool right now. Is there any way this can be made to work again with Nextcloud News?

[Grotax]

Hi, upon research this seems to be because of changes in curl.

https://curl.se/ch/8.1.0.html

Starting that version (some distros might have backportet it) curl does not route .onion URLs anymore.
The behind it is that it would do a normal DNS lookup and that can leak information what content a user wants to see.

There is apparently a new option to leave DNS lookups to the proxy, not sure if that can be implemented in News.

So in short terms the curl on your system was updated and now behaves differently.

[Grotax]

Thinking about this a bit further I think there is no good solution for this.

Nextcloud supports plain http proxy and so do we. For .onion to work curl wants a socks5 proxy.

Maybe a different RSS reader might be better for you or you need to find a way to convince curl to still resolve .onion URLs.