const CC = Components.Constructor;
const BinaryInputStream = CC(
  "@mozilla.org/binaryinputstream;1",
  "nsIBinaryInputStream",
  "setInputStream"
);

function handleRequest(request, response) {
  response.setHeader("Content-Type", "text/plain");
  if (request.method == "GET") {
    response.write(request.queryString);
    return;
  }

  var bodyStream = new BinaryInputStream(request.bodyInputStream);
  var body = "";
  var bodyAvail;
  while ((bodyAvail = bodyStream.available()) > 0) {
    body += String.fromCharCode.apply(
      null,
      bodyStream.readByteArray(bodyAvail)
    );
  }

  response.write(body);
}