The Tor Browser / file revision

 const CC = Components.Constructor;

 const BinaryInputStream = CC("@mozilla.org/binaryinputstream;1",

                              "nsIBinaryInputStream",

                              "setInputStream");

 function setReq(req) {

   setObjectState("content/base/test/progressserver", req);

 }

 function getReq() {

   var req;

   getObjectState("content/base/test/progressserver", function(v) {

     req = v;

   });

   return req;

 }

 function handleRequest(request, response)

 {

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

   var command = pairs.shift();

   dump("received '" + command + "' command\n");

   var bodyStream = new BinaryInputStream(request.bodyInputStream);

   var body = "";

   var bodyAvail;

   while ((bodyAvail = bodyStream.available()) > 0)

     body += String.fromCharCode.apply(null, bodyStream.readByteArray(bodyAvail));

   if (command == "open") {

     response.processAsync();

     setReq(response);

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

     pairs.forEach(function (val) {

       var [name, value] = val.split('=');

       response.setHeader(name, unescape(value), false);

     });

     response.write(body);

     return;

   }

   if (command == "send") {

     getReq().write(body);

   }

   else if (command == "close") {

     getReq().finish();

     setReq(null);

   }

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

   response.write("ok");

 }