<!DOCTYPE>
<html>
<head>
<meta charset="UTF-8">
<script>
function boom() {
  let r = new Request("#a#a");
  setTimeout(function(){
    r.formData();
    setTimeout(function(){
      r.blob();
    }, 0);
  }, 0);
}
addEventListener("DOMContentLoaded", boom);
</script>
</head>
</html>
