Jon Freeman wrote: By my current thinking, without the protocol, the link given is relative...

A link without a protocol is a Protocol-relative URL. A link without a server - first 2 slashes - is a relative link. A link starting with one slash is relative to the document base, one that has no slashes is relative to the page containing the link.

There's no good reason to generate relative links within mudcat.

I don't know why there are two subdomains either - www and none. A redirect from www.mudcat.org to mudcat.org or vice-versa would be simpler. Everything would then have the same origin: Same Origin Policy