see: https://github.com/julienschmidt/httprouter/blob/master/README.md

multiple_h.go

package main

import (
	"fmt"
	"github.com/hydrogen18/stoppableListener"
	"github.com/julienschmidt/httprouter"
	"log"
	"net"
	"net/http"
	"sync"
	"time"
)

type HostSwitch map[string]http.Handler

func (hs HostSwitch) ServeHTTP(w http.ResponseWriter, r *http.Request) {
	if handler := hs[r.Host]; handler != nil {
		handler.ServeHTTP(w, r)
	} else {
		http.Error(w, "Forbidden", 403)
	}
}

func Index(w http.ResponseWriter, r *http.Request, _ httprouter.Params) {
	fmt.Fprint(w, "Welcome!\n")
}

func main() {
	router := httprouter.New()
	router.GET("/", Index)

	log.Print("create router")

	hs := make(HostSwitch)
	for i := 0; i < 10; i++ {
		log.Printf("create host: %s", fmt.Sprintf("hoge%d.dev:5555", i))
		hs[fmt.Sprintf("hoge%d.dev:5555", i)] = router
	}
	l, err := net.Listen("tcp", ":5555")
	if err != nil {
		panic(err)
	}
	sl, err := stoppableListener.New(l)
	if err != nil {
		panic(err)
	}

	s := http.Server{Addr: ":5555", Handler: hs}

	var wg sync.WaitGroup
	go func() {
		wg.Add(1)
		defer wg.Done()
		s.Serve(sl)
	}()

	time.Sleep(10 * time.Second)

	fmt.Println("stopping listener..")
	sl.Stop()
	fmt.Println("waiting on server")
	wg.Wait()
}