Savant web server allows remote attackers to read source code of CGI scripts via a GET request that does not include the HTTP version number.
https://exchange.xforce.ibmcloud.com/vulnerabilities/4616
https://euvd.enisa.europa.eu/vulnerability/EUVD-2000-0518
http://www.securityfocus.com/bid/1313
http://archives.neohapsis.com/archives/bugtraq/2000-05/0469.html