net/test_server/main.go

package main

import (
	"fmt"
	"net/http"
)

func main() {
	http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
		fmt.Println(r.Header)
		fmt.Fprintf(w, "Hello World!")
		w.WriteHeader(200)
	})
	http.ListenAndServe(":8081", nil)
}