self.addEventListener("fetch", function (event) {
  if (!event.request.url.endsWith("sw_clients/does_not_exist.html")) {
    return;
  }

  event.respondWith(
    new Response("", {
      status: 301,
      statusText: "Moved Permanently",
      headers: {
        Location: "refresher_compressed.html",
      },
    })
  );
});