Some clients seem to make strange GET requests.
Like a "GET http://servername.domain/foo.html HTTP/1.1" where you would expect a "GET /foo.html HTTP/1.1".
ASDF-INSTALL was (is?) one of them. And maybe some misconfigured proxy servers (just a guess).
Feature request for TBNL: Strip the "http://servername.domain/" part from the URI when constructing SCRIPT-NAME.