init

main.go

@@ -0,0 +1,38 @@
+package main
+
+import (
+	"flag"
+	"log"
+	"net/http"
+	"strconv"
+)
+
+func main() {
+	port := flag.Int("port", 8080, "port to listen on")
+	flag.Parse()
+
+	mux := http.NewServeMux()
+	mux.HandleFunc("/", IPHandler)
+
+	log.Println("Listening on port", *port)
+	http.ListenAndServe(":"+strconv.Itoa(*port), mux)
+}
+
+func IPHandler(w http.ResponseWriter, r *http.Request) {
+	addr := r.RemoteAddr
+
+	w.Write([]byte(addr))
+	w.Write([]byte("\n"))
+
+	if r.Header.Get("X-Real-IP") != "" {
+		w.Write([]byte("X-Real-IP: "))
+		w.Write([]byte(r.Header.Get("X-Real-IP")))
+		w.Write([]byte("\n"))
+	}
+
+	if r.Header.Get("X-Forwarded-For") != "" {
+		w.Write([]byte("X-Forwarded-For: "))
+		w.Write([]byte(r.Header.Get("X-Forwarded-For")))
+		w.Write([]byte("\n"))
+	}
+}