fune/testing/web-platform/tests/XMLHttpRequest/access-control-basic-allow-preflight-cache-timeout.htm

<!DOCTYPE html>
<html>
  <head>
    <title>Preflight cache should be invalidated on timeout</title>
    <script src="/resources/testharness.js"></script>
    <script src="/resources/testharnessreport.js"></script>
    <script src="/common/get-host-info.sub.js"></script>
    <script src="/common/utils.js"></script>
  </head>
  <body>
    <script type="text/javascript">
    const uuid = token();
    let xhr = new XMLHttpRequest;

    async_test(function(test) {
      xhr.onerror = test.unreached_func("FAIL: Network error.");
      xhr.onload = test.step_func(function() {
        // Token reset.  We can start the test now.
        assert_equals(xhr.responseText, "PASS");
        firstRequest();
      });

      xhr.open("GET", get_host_info().HTTP_REMOTE_ORIGIN + "/XMLHttpRequest/resources/reset-token.py?token=" + uuid, true);
      xhr.send();

      function firstRequest() {
        xhr.onload = test.step_func(function() {
          assert_equals(xhr.responseText, "PASS: First PUT request.");
          step_timeout(secondRequest, 3000); // 3 seconds
        });
        xhr.open("PUT", get_host_info().HTTP_REMOTE_ORIGIN + "/XMLHttpRequest/resources/access-control-basic-preflight-cache-timeout.py?token=" + uuid, true);
        xhr.send();
      }

      function secondRequest() {
        xhr.onload = test.step_func(function() {
          assert_equals(xhr.responseText, "PASS: Second OPTIONS request was sent.");
          test.done();
        });
        xhr.open("PUT", get_host_info().HTTP_REMOTE_ORIGIN + "/XMLHttpRequest/resources/access-control-basic-preflight-cache-timeout.py?token=" + uuid, true);
        xhr.send();
      }
    }, "Preflight cache should be invalidated on timeout");
    </script>
  </body>
</html>