Verifying standard.site integration with Bluesky

I got Claude to write a verification script to see if a site will display nice previews on Bluesky. After fixing some bugs I got it in pretty good shape. Now you don't have to wonder why Bluesky is not showing your blog post the way you expected! This applies only when you paste a blog post link in a Bluesky post, not for Bluesky posts that are generated by apps. Sadly, the Bluesky crawler doesn't execute Javascript so these previews won't work for client-side apps/SPAs, including Lemma. But when pasting a link to a server-side blog platform it should tell you exactly what's missing if you're not getting the nice previews on Bluesky. Save the file as checkblueskypreview.py Call it with the blog post url you want to check e.g.