rand_server.go

package main

import (
	"math/rand"
	"time"
	"io"
	"net/http"
	"strconv"
)

var r *rand.Rand = rand.New(rand.NewSource(time.Now().UnixNano()))

func main() {
	http.HandleFunc("/", getRand)
	http.ListenAndServe(":8080", nil)
}

func getRand(res http.ResponseWriter, req *http.Request) {
	io.WriteString(res, getRandUint64())
}

func getRandUint64() string {
	randNum := r.Uint64()
	return strconv.FormatUint(randNum, 10)
}