<!DOCTYPE html>
<script src="../server-locations.sub.js"></script>
<script>
  try {
    var w1 = new Worker(http_dir + "support/dedicated-worker-script.js");
    w1.onmessage = function(e) {
      parent.postMessage({ type: "http", error: false,
                           isSecureContext: e.data }, "*");
    };
    w1.onerror = function(e) {
      parent.postMessage({ type: "http", error: true }, "*");
    };
  } catch (e) {
    // Some browsers throw for cross-origin URLs. This violates the Worker spec,
  