Since I went through a main server reinstall I also moved my sub-sites to new domain names. Lupus is now listening on http://lupus.request-response.com and my little playground page is located on http://playground.request-response.com.
Redirects from http://www.request-response.com/lupus and http://www.request-response.com/playground are not available and will probably never be. If anyone has a permanent endpoint on RSS Query web service, she will know soon. ;)