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WEBrick uses for creating listeners Socket.tcp_server_sockets. If tcp_server_sockets is given host: nil, it opens socket on [::] address (IPv6 if available) and while on 0.0.0.0 (if IPv4 if available). See documentation: http://docs.ruby-lang.org/en/2.2.0/Socket.html#method-c-tcp_server_sockets
Closes #833