The default welcome files are the usual index.cfm, index.htm, index.html, etc but you can override this with the
welcomeFiles setting in your
server.json by providing a comma-delimited list of files that you would like CommandBox to look for when a user hits a directory on a running server.
server set web.welcomeFiles='go.cfm,main.cfm,index.html'
This setting is a complete override of the defaults, so you need to specify the full list.