In the RSS feeds the server generates, a reply's <source:inReplyTo> element now carries the parent post's actual permalink, for example https://rss.chat/?id=163. Follow the link and you're looking at the post being replied to. Before this, the element pointed at a /parent URL that was never implemented, so the link led nowhere. If you're building on the feeds, this means reply threads are now traversable from the feed alone. (Server v0.5.18.)