Don't Allow a URL containing an MS-DOS device name

Thanks!

My final script ended up like this:
when RULE_INIT {
    set ::DEBUG 0
    set ::CLASSLIST “msdosdn”

\}

when HTTP\_REQUEST \{
  set URI [string tolower [HTTP::uri]]
  if \{ [CLASS::match $URI contains $::CLASSLIST value] != ""\} \{

HTTP::respond 404 content “Your request was blocked”

    if \{ $::DEBUG == 1 \} \{ log "[HTTP::host] found match in URI: $URI" \}
  \}
\}