“Status Code:200 OK (from ServiceWorker)” in Chrome Network DevTools?

Question

I am familiar with http status codes, but recently I saw a strange line in my chrome debugger. Instead of ordinary Status Code:200 OK I saw the following:

Answer 1

A service worker is a script that is run by your browser in the background. So Status Code:200 OK (from ServiceWorker) mean that “OK” success code, for GET or HEAD request and this status come from ServiceWorker.

You can read this link to understand more about this. http://www.html5rocks.com/en/tutorials/service-worker/introduction/