grunt-contrib-connect - Fatal error: getaddrinfo ENOTFOUND my.website - How to set up custom URL?

I want to use grunt-contrib-connect to create a server under a specific URL, let's say http://my.website/. According to the documentation, all I need to do is just to change the hostname option, but I keep getting an error saying: Fatal error: getaddrinfo ENOTFOUND my.website.

Here's my Gruntfile.js:

connect: {

    dev: {

        options: {

            keepalive:  true,
            port:       80,
            hostname:   'my.website',
            base:       'public'

        }

    }

},

Thanks.