title: Node.js server.address().address returns ::
body: <p>If I remember correctly it used to display "localhost" a few days ago. I am not sure what had changed that made server.address().address return double colons (::) instead.
  I read here that it returns an IPv6 address (::) if it is available but it's disabled on my PC.
  <a href="https://nodejs.org/api/http.html#http_server_listen_port_hostname_backlog_callback">https://nodejs.org/api/http.html#http_server_listen_port_hostname_backlog_callback</a></p>