uWSGI --http :80 doesn't listen IPv6 interface
In your INI config file specify something like this 
[uwsgi]
socket = [::]:your_port_number
Or from the CL, 
./uwsgi -s [::]:your_port_number
The server shall now listen along all the interfaces (including IPv4, if the underlying OS supports dual stack TCP sockets)
Why doesn't uWSGI listen on IPv6 interface, even if system is 100% IPv6 ready? As far as I could see there aren't parameters nor documentation covering this issue.