Failed to execute 'fetch' on 'ServiceWorkerGlobalScope'

Hey,

I'm getting this error:

`Uncaught (in promise) TypeError: Failed to execute 'fetch' on 'ServiceWorkerGlobalScope': 'only-if-cached' can be set only with 'same-origin' mode.

This is my config:

```js
new OfflinePlugin({
  externals: ["/"],
  responseStrategy: "network-first"
})
```