AFAIU HN's posting system strips URL parameters. If they're significant to your post you can email the mods at hn@ycombinator.com to restore them. You might a

AFAIU HN's posting system strips URL parameters. If they're significant to your post you can email the mods at hn@ycombinator.com to restore them. You might also want to write a top-level comment clarifying what you find significant about the URL and/or specific query.