web-server.go

package main

import (
	"fmt"
	"net/http"
)

// hello world, the web server
func HelloServer(w http.ResponseWriter, r *http.Request) {
	fmt.Fprintf(w, "Hello, world!")
}

func main() {
	http.HandleFunc("/hello", HelloServer)
	http.ListenAndServe(":12345", nil)
}