fail.js

const http = require('http')

// queue
let queue = []

function httpget (i) {
  http.get(process.argv[i + 2], (res) => {
    let all = ''

    res.on('data', (data) => {
      all += data.tostring()
    })

    res.on('end', () => {
      console.log(i)
      queue[i] = all

      if (queue.length === 3) {
        print()
      }
    })
  })
}

for (var i = 0; i < process.argv.length - 2; i++) {
  httpget(i)
}

function print () {
  for (var i = 0; i < queue.length; i++) {
    console.log(queue[i])
  }
}