intercept.all.ajax.requests.with.pure.javascript.js

// @source answer   https://stackoverflow.com/a/27363569/7325594
// @source question https://stackoverflow.com/questions/5202296/add-a-hook-to-all-ajax-requests-on-a-page
(function () {
  var origOpen = XMLHttpRequest.prototype.open
  XMLHttpRequest.prototype.open = function () {
    console.log('request started!')
    this.addEventListener('load', function () {
      console.log('request completed!')
      console.log(this.readyState) // will always be 4 (ajax is completed successfully)
      console.log(this.responseText) // whatever the response was
    })
    origOpen.apply(this, arguments)
  }
})()