First, make sure that you have key.pem and cert.pem files. You can generate them using this command:
openssl req -newkey rsa:2048 -new -nodes -x509 -days 3650 -keyout key.pem -out cert.pem
You will be prompted with a few questions after entering the command. Use 127.0.0.1 as value for “Common name” if you want to be able to install the certificate in your OS’s root certificate store or browser so that it is trusted.
This generates a cert-key pair and it will be valid for roughly 10 years (3650 days to be exact).
Then you need to run the server with -S for enabling SSL and -C for your certificate file:
$ http-server -S -C cert.pem -o
Starting up http-server, serving ./ through https
Available on:
https:127.0.0.1:8080
https:192.168.1.101:8080
https:192.168.1.104:8080
Hit CTRL-C to stop the server