Thanks Dave. To try to clariy I wasn’t thinking in terms of generating a relative link but questioning the correct interpretation for an absolute link from user input such mudcat.org/... and www.mudat.org/… Whatever, a server rewrite rule would be a good idea. Far from all links here are created using a generator plus there must be a lot of threads pointing to dead subdomains around.

I think when I started here, probably late 1999, Mudat was using www as its main website domain. Other sub domains came in as the result of crashes and us learning how to access individual servers.   We could for example find www inaccessible but loki up and running. I think using “backdoors” (if any exist) is frowned upon these days because it can cause complications with links.