respond-with-body-accessed-response-iframe.html

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<script>

var callback;

// Creates a <script> element with |url| source, and returns a promise for the

// result of the executed script. Uses JSONP because some responses to |url|

// are opaque so their body cannot be tested directly.

function getJSONP(url) {

  var sc = document.createElement('script');

  sc.src = url;

  var promise = new Promise(function(resolve, reject) {

      // This callback function is called by appending a script element.

      callback = resolve;

      sc.addEventListener(

          'error',

          function() { reject('Failed to load url:' + url); });

});

  document.body.appendChild(sc);

  return promise;

</script>