How would I serve up a directory listing?

I'm looking for an embedded HTTP server that I can code in C++ , and among other things, be able to define a route
that returns a directory listing from .../public/logs/ directory, for example. This directory will contain many *.csv files.
The end goal is to allow a person to select one of the *.csv files and have the result navigate to another specific html file that parameterizes the file name so I can part and display csv file's content as needed.

Also please point where were it's explained how to upgrade to websocket.

Thanks