// main.go

package main

import (

    "fmt"

    "log"

    "net/http"

    "os"

    "os/signal"

    "syscall"

    "time"

)

func main() {

    http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {

        fmt.Fprintf(w, "Hello World, %v\n", time.Now())

    })

    s := &http.Server{

        Addr:           ":8080",

        Handler:        http.DefaultServeMux,

        ReadTimeout:    10 * time.Second,

        WriteTimeout:   10 * time.Second,

        MaxHeaderBytes: 1 << 20,

    }

    go func() {

        log.Println(s.ListenAndServe())

        log.Println("server shutdown")

    }()

    // Handle SIGINT and SIGTERM.

    ch := make(chan os.Signal)

    signal.Notify(ch, syscall.SIGINT, syscall.SIGTERM)

    log.Println(<-ch)

    // Stop the service gracefully.

    log.Println(s.Shutdown(nil))

    // Wait gorotine print shutdown message

    time.Sleep(time.Second * 5)

    log.Println("done.")

}