Echo JS 0.11.0

I implemented a service worker that intercepts requests and can return any error code / data. Great to exploratory testing. See http://glebbahmutov.com/blog/robustness-testing-using-proxies/ and code at https://github.com/bahmutov/service-turtle

The bad thing about service workers - they are very fresh. Even in Chrome they did not have a way to communicate back to the main window any result - post message mechanism was broken. I feel soon the problems will be fixed and every website will use them.

yeah, the state of service workers is far from ideal. Debugging is a bit of a black box and the APIs aren't final yet. But I have a hunch that jumping in now is a very clever idea because service workers really are great and like you said, every website will(should) start using them soon.