Oh wow, I think HN normalized the unicode with punycode since it's a URL. I submitted with ①②⑦.⓪.⓪.① inside the http:// and :8000 And the punicode version also works for me :)
PaleMoon browser refuses to open the xn--orhcp link, and shows nothing in the status bar for it. Right click doesn't give the option to open it either, only bookmark.
http://xn--orhcp.xn--mvh.xn--mvh.xn--orh:8000 -> http://127.0.0.1:8000