route/cmd/helloserver/main.go

package main

import (
	"flag"
	"fmt"
	"net/http"
)

var (
	port = flag.String("port", "9090", "HTTP port to listen on")
)

func main() {
	flag.Parse()
	http.ListenAndServe(":"+*port, http.HandlerFunc(handle))
}

func handle(w http.ResponseWriter, r *http.Request) {
	fmt.Fprintln(w, "Route is go!")
	fmt.Fprintf(w, "%#v\n", r.Header)
}