Perhaps the issue is with the way Substack publishes RSS? I’m able to make the shortcode work when I test non-Substack RSS feeds. When I include Substack’s feeds, I get this error:
execute of template failed: template: shortcodes/substack-updated.html:3:12: executing "shortcodes/substack-updated.html" at <.Content>: error calling Content: error calling resources.GetRemote: failed to resolve media type for remote resource "https://fastwomen.substack.com/feed.rss"
When I review the URL, the feed looks like a proper RSS feed:
https://fastwomen.substack.com/feed.rss
It’s also validates:
Feed Validator Results: https://fastwomen.substack.com/feed.rss (albeit, with many recommendations)
Do I need to add security.http to my site configuration?