golang upload client and server

upload.go

// curl -X POST -H "Content-Type: application/octet-stream" --data-binary '@filename' http://127.0.0.1:5050/upload

package main

import (
	"fmt"
	"io"
	"net/http"
	"os"
	"time"
	"io/ioutil"
)

func uploadHandler(w http.ResponseWriter, r *http.Request) {
	file, err := os.Create("./result")
	if err != nil {
		panic(err)
	}
	n, err := io.Copy(file, r.Body)
	if err != nil {
		panic(err)
	}

	w.Write([]byte(fmt.Sprintf("%d bytes are recieved.\n", n)))
}

func main() {
	http.HandleFunc("/upload", uploadHandler)

	go func() {
		time.Sleep(time.Second * 1)
		upload()
	}()

	http.ListenAndServe(":5050", nil)
}

func upload() {
	file, err := os.Open("./filename")
	if err != nil {
		panic(err)
	}
	defer file.Close()

	res, err := http.Post("http://127.0.0.1:5050/upload", "binary/octet-stream", file)
	if err != nil {
		panic(err)
	}
	defer res.Body.Close()
	message, _ := ioutil.ReadAll(res.Body)
	fmt.Printf(string(message))
}

@ebraminio, this code works well. Good job!
Quick question:
what are you doing with the anonymous go routine at line# 30 - 33 & the func upload()? Are they necessary?
Program works even if I commented them. Shall we safely ignore them?

Sorry for the very late, probably will be useful for others at least,

Are they necessary?

No, it's only for testing

Shall we safely ignore them?

Sure.