If you are not "stuck" using stateless http, you can setup your own server, and give clients to your staff. It's alot easier, and more "eavesdropping-proof". Tk encrypted echoing-chat client and server is encrypted and has a few bells and whistles, but you could also just use one of the basic echoing chat servers-client pairs, of which there are many basic examples. Of course your firewall has to allow you to use your chosen port.