concurrent-requests.go

package main

import (
     "fmt"
     "os"
     "net/http"
     "time"
     "io/ioutil"
     "strconv"
)

func MakeRequest(url string, ch chan<-string) {
  start := time.Now().UnixNano()
  resp, _ := http.Get(url)
  body, _ := ioutil.ReadAll(resp.Body)

  ch <- fmt.Sprintf("%d %s", start, body)
}

func main() {
  url := os.Args[1]
  nrOfRequests, _ := strconv.Atoi(os.Args[2])
  ch := make(chan string)

  for i := 0; i < nrOfRequests; i++ {
      go MakeRequest(url, ch)
  }

  for i := 0; i < nrOfRequests; i++ {
    fmt.Println(<-ch)
  }
}