test.html

<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.4.2/jquery.min.js"></script>

<script>

  $(document).ready(function() {
    $.ajax({
      type: "HEAD",
      async: true,
      url: "http://bashme.org/phd_18yo_apriloneil2_trailer.mov",
      success: function(message, text, response) {
        console.log("success");
      },
      error: function(message, text, response) {
        console.log("error");
      }
    });
  });

</script>