gecko-dev/netwerk/test/mochitests/method.sjs

function handleRequest(request, response) {
  // avoid confusing cache behaviors
  response.setHeader("Cache-Control", "no-cache", false);
  response.setHeader("Content-Type", "text/plain", false);
  response.setHeader("Access-Control-Allow-Origin", "*", false);

  // echo method
  response.write(request.method);
}