Comment by scanr

Asked for an HTTPS one liner on stackoverflow a while back and got this answer:

    ruby -r webrick/https -e '
      WEBrick::HTTPServer.new(
        Port: 8000, DocumentRoot: ".",
        SSLEnable: true, SSLCertName: [%w[CN localhost]]).start'

https://stackoverflow.com/a/37986354/59325