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function assertOkResponse(response) {
if (response.type === 'opaque' || response.status === 200) {
return response;
}
throw Error("Bad response: " + response.status);
}
fetch(url, {'mode': 'cors'}).then(assertOkResponse).then(function(response) {
// cache
}).catch(function(err) {
console.error('Fetch Error :-S', err);
throw err;
});
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