FALLBACK RESOURCE IN THE CASE OF NO-NETWORK

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In the case where Raspberry Digital Signage is loading content from the network and the network goes down, in which way can I display a fallback resource in the meanwhile network goes up again?

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Usually web pages built for signaging contain a Javascript code which continues checking for network availablity (once loaded).

In the case the network goes down, the Javascript code should redirect the internal browser to a locally hosted resource (/rds/var/www).
The local resource will do the same job, inverted.

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