package main

import (
	"flag"
	"fmt"
	"log"
	"math/rand"
	"net/http"
	"time"

	"github.com/gorilla/mux"
)

func main() {

	// register variables
	var port = flag.Int("p", 8081, "port the http server listens on")
	flag.Parse()

	// http foo
	r := mux.NewRouter()
	r.HandleFunc("/{.*}", indexHandler)

	log.Fatal(http.ListenAndServe(fmt.Sprintf(":%d", *port), r))
}

func indexHandler(w http.ResponseWriter, r *http.Request) {

	// seed using a truly random value
	rand.Seed(time.Now().UnixNano())

	// return a random value in range 100 to 511
	w.WriteHeader(rand.Intn(311) + 200)
}