The Tor Browser / file revision

 function parseQuery(request, key) {

   var params = request.queryString.split('&');

   for (var j = 0; j < params.length; ++j) {

     var p = params[j];

 	if (p == key)

 	  return true;

     if (p.indexOf(key + "=") == 0)

 	  return p.substring(key.length + 1);

 	if (p.indexOf("=") < 0 && key == "")

 	  return p;

   }

   return false;

 }

 // Return file content for the first request with a given key.

 // All subsequent requests return a redirect to a different-origin resource.

 function handleRequest(request, response)

 {

   var domain = parseQuery(request, "domain");

   var file = parseQuery(request, "file");

   var allowed = parseQuery(request, "allowed");

   response.setStatusLine(request.httpVersion, 303, "See Other");

   response.setHeader("Location", "http://" + domain + "/tests/content/media/test/" + (allowed ? "allowed.sjs?" : "") + file);

   response.setHeader("Content-Type", "text/html");

 }