It seems, something is wrong with worg deployment curl -I https://orgmode.org/worg/org-contrib/org-protocol.html HTTP/1.1 404 Not Found Server: nginx/1.14.2 Date: Thu, 30 Sep 2021 12:10:08 GMT Content-Type: text/html; charset=UTF-8 Content-Length: 169 Connection: keep-alive
org-contrib/org-protocol.org file is still in the worg repository, it is referenced from https://orgmode.org/worg/org-contrib/index.html
The file contains a lot of outdated information but I have not noticed any sign that it has been hidden intentionally.