Changed the listening host to be the same as when unspecified
Changed the listening host to be the same as when unspecified

'0.0.0.0' only listens on IPv4 address whereas if the host is unspecified for 'listen' method, it will listen on '::' which covers both IPv4 and IPv6.
https://nodejs.org/api/net.html#net_server_listen_port_host_backlog_callback
Postleaf/postleaf