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// https://gist.github.com/miguelmota/7b765edff00dc676215d6174f3f30216
package main
import (
"errors"
"log"
"net"
"net/http"
"strings"
)
func getIP(r *http.Request) (string, error) {
ips := r.Header.Get("X-Forwarded-For")
splitIps := strings.Split(ips, ",")
if len(splitIps) > 0 {
netIP := net.ParseIP(splitIps[len(splitIps)-1])
if netIP != nil {
return netIP.String(), nil
}
}
ip, _, err := net.SplitHostPort(r.RemoteAddr)
if err != nil {
return "", err
}
netIP := net.ParseIP(ip)
if netIP != nil {
ip := netIP.String()
if ip == "::1" {
return "127.0.0.1", nil
}
return ip, nil
}
return "", errors.New("IP not found")
}
func handler(w http.ResponseWriter, r *http.Request) {
ip, err := getIP(r)
if err != nil {
w.WriteHeader(http.StatusInternalServerError)
return
}
w.WriteHeader(http.StatusOK)
w.Write([]byte(ip))
}
func main() {
http.HandleFunc("/", handler)
log.Fatal(http.ListenAndServe(":8080", nil))
}
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