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main.go
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main.go
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package main
import (
"log"
"net"
"net/http"
"net/netip"
"os"
)
func main() {
const portStr = ":8080"
myaddr := getLocalAddr()
host, _ := os.Hostname()
svAddr := myaddr.String() + portStr
sv := http.NewServeMux()
sv.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
w.Write([]byte("Dear " + r.RemoteAddr + ",\nGreetings from " + host + " @ " + svAddr + "\n"))
})
log.Println("Listening on", svAddr)
err := http.ListenAndServe(portStr, sv)
if err != nil {
panic(err)
}
}
func getLocalAddr() netip.Addr {
conn, err := net.Dial("udp", "8.8.8.8:80")
if err != nil {
log.Fatal(err)
}
defer conn.Close()
localAddr := conn.LocalAddr().(*net.UDPAddr)
addr, ok := netip.AddrFromSlice(localAddr.IP)
if !ok {
log.Fatal("failed to convert local address")
}
return addr
}