Set 0.0.0.0 to default hostname
Set 0.0.0.0 to default hostname

The node http module, which express inherits from, use 0.0.0.0 as the default (as described here: https://nodejs.org/api/http.html#http_server_listen_port_hostname_backlog_callback)

> If the hostname is omitted, the server will accept connections on any IPv6 address (::) when IPv6 is available, or any IPv4 address (0.0.0.0) otherwise.
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