feat: add simple http server

simple_httpserver/simpleserver.go

@@ -0,0 +1,47 @@
+package main
+
+import (
+	"fmt"
+	"log"
+	"net"
+	"os"
+ 	"net/http"
+)
+
+func main() {
+	listen := "0.0.0.0:8000"
+	log.Print("Start simple server at port: ", listen)
+	http.HandleFunc("/", handler)
+	log.Fatal(http.ListenAndServe(listen, nil))
+}
+
+func handler(w http.ResponseWriter, r *http.Request) {
+
+	log.Println("request from address: ", r.RemoteAddr)
+	fmt.Fprintf(w, "%s %s %s\n", r.Method, r.URL, r.Proto)
+	for k, v := range r.Header {
+		fmt.Fprintf(w, "Header[%q] = %q\n", k, v)
+	}
+	fmt.Fprintf(w, "Host = %q\n", r.Host)
+	fmt.Fprintf(w, "RemoteAddr = %q\n", r.RemoteAddr)
+	if err := r.ParseForm(); err != nil {
+		log.Print(err)
+	}
+	for k, v := range r.Form {
+		fmt.Fprintf(w, "Form[%q] = %q\n", k, v)
+	}
+	fmt.Fprintf(w, "\n===> local IP: %q\n\n",GetOutboundIP())
+	//fmt.Fprintf(w, "Env message = %s\n", os.Getenv("message"))
+}
+
+func GetOutboundIP() net.IP {
+    conn, err := net.Dial("udp", "8.8.8.8:80")
+    if err != nil {
+        log.Fatal(err)
+    }
+    defer conn.Close()
+
+    localAddr := conn.LocalAddr().(*net.UDPAddr)
+
+    return localAddr.IP
+}