For example: https://forum.xda-developers.com/lineage/help/feed I’d like to have a rss news feed of this. Is it possible to make the News Feed app in nextcloud convert this URL to an RSS feed? If not, what can I do to get/create the RSS feed of that url?
The News app is an RSS /Atom feed reader, if a page doesn’t provide a RSS/ATOM feed, it’s not possible. But you can try to search for rss in the source of the page and use this URL in the news-reader
For your example you’ll find https://data.xda-developers.com/portal-feed
As @amarillo wrote, it’s not the job of the News app to convert forums to the RSS format.
Nevertheless XDA developers in general seems to support RSS feeds, see https://forum.xda-developers.com/showthread.php?t=222464&page=5&nocache=1 for details.
Based on this information you could give this url a try: https://forum.xda-developers.com/external.php?type=RSS2&forumids=6082
Not sure I follow how to find that url in the source. I inspected the page https://forum.xda-developers.com/ (chromium based browser) which I believe is the page you found the rss feed on, and I checked the sources and I don’t see any url like the one you linked. Here is what I see:
What am I doing wrong?
use in the adressline: view-source:https://forum.xda-developers.com/
There are 2 occurrences of “rss”
<link rel="alternate" type="application/rss+xml" title="xda-developers RSS Feed" href="[external.php?type=RSS2](view-source:https://forum.xda-developers.com/external.php?type=RSS2)" />
<a href="[https://data.xda-developers.com/portal-feed](view-source:https://data.xda-developers.com/portal-feed)" class="panel-social-target"> <svg class="iconz-social iconz-rss"><use xlink:href="[#iconz-rss](view-source:https://forum.xda-developers.com/#iconz-rss)"></use></svg>
With this URL you get some new posts in nextcloud ex: