A hook program that forwards incoming Microsoft Teams websocket messages to all subscribed clients. The source of those notifications is the Teams Hook Client Microsoft Edge extension that forwards all incoming websocket messages to this WebHook.
To create a temporary self-signed certificate run the following command.
openssl req -new -x509 -nodes -newkey ec:<(openssl ecparam -name secp384r1) -keyout cert.key -out cert.crt -days 3650