Always use HTTPS especially with a terminal to your server. You can add HTTPS by either using WeTTY behind a proxy or directly.
See docs for NGinX and Apache for running behind a proxy.
To run WeTTY directly with SSL use both the --ssl-key and --ssl-cert flags
and pass them the path too your cert and key as follows:
wetty --ssl-key key.pem --ssl-cert cert.pem
If you don’t have SSL certificates from a CA you can create a self signed certificate using this command:
openssl req -x509 -newkey rsa:2048 -keyout key.pem -out cert.pem -days 30000 -nodes