The Tor Browser / file revision

 /**

  * Any copyright is dedicated to the Public Domain.

  * http://creativecommons.org/publicdomain/zero/1.0/

  */

 function handleRequest(request, response)

 {

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

   response.setHeader("Cache-Control", "no-cache", false);

   if (request.method == "POST") {

     setState("seenPost" + request.queryString, "1");

     return;

   }

   if (request.method == "GET") {

     if (getState("seenPost" + request.queryString) == "1") {

       response.write("closed");

     }

     return;

   }

   response.setStatusLine(request.httpVersion, 404, "Not found");

 }