func Hello(w http.ResponseWriter, r *http.Request) {
log.Println("%s called /", r.Host)
w.Header().Set("Content-Type", "text/html")
ifaces, _ := net.Interfaces()
var ip net.IP
for _, i := range ifaces {
addrs, _ := i.Addrs()
for _, addr := range addrs {
switch v := addr.(type) {
case *net.IPNet:
ip = v.IP
case *net.IPAddr:
ip = v.IP
}
}
}
b, _ := ip.MarshalText()
res := fmt.Sprintf("<div style='text-align:center;'><p style='font-size:5em'>%s</p><p style='font-size:3em'>v2.0</p></div>", b)
w.Write([]byte(res))
}