const CC = Components.Constructor; const BinaryInputStream = CC("@mozilla.org/binaryinputstream;1", "nsIBinaryInputStream", "setInputStream"); const BinaryOutputStream = CC("@mozilla.org/binaryoutputstream;1", "nsIBinaryOutputStream", "setOutputStream"); function handleRequest(request, response) { var bodyStream = new BinaryInputStream(request.bodyInputStream); var bodyBytes = []; while ((bodyAvail = bodyStream.available()) > 0) Array.prototype.push.apply(bodyBytes, bodyStream.readByteArray(bodyAvail)); var bos = new BinaryOutputStream(response.bodyOutputStream); response.processAsync(); bos.writeByteArray(bodyBytes); response.finish(); }