A literal IP address or host name that can be resolved to an IP address.
If not specified, defaults to
0.0.0.0 While listening
0.0.0.0 works on all platforms,
the browsers on Windows don't work with the address
You should show the message like
server running on localhost:8080 instead of
server running on 0.0.0.0:8080 if your program supports Windows.