←  offliner-source-network.js
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How to write a network source
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Remember including offliner will export the off module with a namespace reserved for sources. Put your source inside.
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A source is a function that will be passed with a request and the active offline cache. The source must return a promise resolving with the proper response or rejecting when response is not available.

 
self.off.sources.network = function (request) {
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This case we simply redirect the request to the network.

 
  return fetch(request);
};