<!doctype html>
<html>
  <head>
    <meta charset="utf-8">
    <title>SendBeacon keepalive flag</title>
    <script src=/resources/testharness.js></script>
    <script src=/resources/testharnessreport.js></script>
  </head>
  <body>
    <script src="/common/utils.js"></script>
    <script src="/common/get-host-info.sub.js"></script>
    <script>
const RESOURCES_DIR = "/beacon/resources/";

function pollResult(test, id) {
  var checkUrl = RESOURCES_DIR + "content-type.py?cmd=get&id=" + id;

  return new Promise(resolve => {
    step_timeout(test.step_func(() => {
      fetch(checkUrl).then(response => {
        response.text().then(body => {
          resolve(body);
        });
      });
    }), 1000);
  });
}

onload = function() {
    promise_test(function(test) {
    let testFrame = document.getElementById("testFrame");
    let id = testFrame.contentWindow.id;
    testFrame.remove();

    return pollResult(test, id).then(result => {
      assert_equals(result, "text/plain;charset=UTF-8", "Correct content-type header result");
    });
  }, "Test that beacon sent from unload event handler is properly received");
}
    </script>
  <iframe id="testFrame" src="support/sendBeacon-onunload-iframe.html"></iframe>
  </body>
</html>