// X:\jsc.svn\examples\javascript\test\TestServiceWorkerAssetCache\TestServiceWorkerAssetCache\Application.cs
public IPromise<object> put(Request request, Response response) { return null; }
// client side web service like activity?
//void respondWith((Response or Promise<Response>) r);
// how can we translate Task to Promise?
// can we then update jsc to do it automagically?
// https://chromium.googlesource.com/chromium/blink.git/+/master/Source/modules/serviceworkers/RespondWithObserver.h
public void respondWith(Response r) { }