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Check online status before prefetching URLs #74

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Check online status before prefetching URLs #74

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Commits on May 23, 2020

  1. Check online status before prefetching URLs 

    Related to issue #73

As a website owner, I want to only prefetch URLs when I am online, so that I am not getting network errors when my site is offline or served by a service-worker.

Changes:

- Implement isOnline function to check online status via navigator.onLine (https://developer.mozilla.org/de/docs/Web/API/NavigatorOnLine/onLine).
- Implement guard in preload function to check online status with this function.

Only tested on my setup. Has to be tested on larger scope before merging.
    @tobiasschmidt89
    tobiasschmidt89 authored May 23, 2020
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