Start a server with rewrites and place a static file like an image in a sub folder that has a space in it and hit that image from the URL. The rewrite rule will kick in and try to add /index.cfm because the image path won't be found on disk. Enabling the URL rewrite log and starting the server with --trace will reveal that the file path in use contains the %20 instead of a space. Tuckey seems to be mishandling the space. Possibly not casting a URL to a URI Path.