The Tor Browser / file revision

 // SJS file that receives violation reports and then responds with nothing.

 const CC = Components.Constructor;

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

                               "nsIBinaryInputStream",

                               "setInputStream");

 const STATE = "bug836922_violations";

 function handleRequest(request, response)

 {

   var query = {};

   request.queryString.split('&').forEach(function (val) {

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

     query[name] = unescape(value);

   });

   if ('results' in query) {

     // if asked for the received data, send it.

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

     if (getState(STATE)) {

       response.write(getState(STATE));

     } else {

       // no state has been recorded.

       response.write(JSON.stringify({}));

     }

   } else if ('reset' in query) {

     //clear state

     setState(STATE, JSON.stringify(null));

   } else {

     // ... otherwise, just respond "ok".

     response.write("null");

     var bodystream = new BinaryInputStream(request.bodyInputStream);

     var avail;

     var bytes = [];

     while ((avail = bodystream.available()) > 0)

       Array.prototype.push.apply(bytes, bodystream.readByteArray(avail));

     var data = String.fromCharCode.apply(null, bytes);

     // figure out which test was violating a policy

     var testpat = new RegExp("testid=([a-z0-9_]+)");

     var testid = testpat.exec(data)[1];

     // store the violation in the persistent state

     var s = getState(STATE);

     if (!s) s = "{}";

     s = JSON.parse(s);

     if (!s) s = {};

     if (!s[testid]) s[testid] = 0;

     s[testid]++;

     setState(STATE, JSON.stringify(s));

   }

 }