const CC = Components.Constructor; const BinaryInputStream = CC("@mozilla.org/binaryinputstream;1", "nsIBinaryInputStream", "setInputStream"); function handleRequest(request, response) { response.setHeader("Content-Type", "text/plain", false); var body = new BinaryInputStream(request.bodyInputStream); var avail; var bytes = []; while ((avail = body.available()) > 0) Array.prototype.push.apply(bytes, body.readByteArray(avail)); var data = String.fromCharCode.apply(null, bytes); response.bodyOutputStream.write(data, data.length); }