[w3c/ServiceWorker] What's the possible reason for navigator.serviceWorker.register error？ (#1275)

I register service worker like this:
```
navigator.serviceWorker.register('/sw.js', {
    scope: '/'
}).then(function(registration) {}).catch(function(err) {console.log(err)})
```
In production environment, I caught some errors like `The request to fetch the script was interrupted. `and `The Service Worker system has shutdown.` What's the possible reasons for above errors?

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