The server built in to TiddlyWiki5 is very simple. Although compatible with TiddlyWeb it doesn't support many of the features needed for robust Internet-facing usage - in particular, TiddlyWiki5 is an old-school wiki in the sense that it offers no authentication.
At the root, it serves a rendering of a specified tiddler. Away from the root, it serves individual tiddlers encoded in JSON, and supports the basic HTTP operations for
--server <port> <roottiddler> <rendertype> <servetype> <username>
The parameters are:
If the password parameter is specified then the browser will prompt the user for the username and password. Note that the password is transmitted in plain text so this implementation isn't suitable for general use.
--server 8080 $:/core/tiddlywiki5.template.html text/plain text/html MyUserName