server.go

package main

import (
    "log"
    "net/http"
    "os"
)

func build_handler(msg string) func(http.ResponseWriter, *http.Request) {
	return  func(writer http.ResponseWriter, request *http.Request) {
	    writer.Write([]byte(msg + "\n"))
	}
}

func main() {
    msg:= os.Args[1]
    http.HandleFunc("/", build_handler(msg))
    log.Fatal(http.ListenAndServe(":8888", nil))
}