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I can download the website using the service Worker on Android Chrome, macOS Chrome as well as Safari and on Windows Chrome for offline use. When I try to download the website to iOS 12.1 Safari it works first. But when I close Safari, go offline and reopen Safari, I get the following error message : Safari can't open the Site. Error: "FetchEvent.respondWith received an error: TypeError: There seems to be no connection to the Internet." ==== AND in the console ==== FetchEvent.respondWith received an error: Returned response is null Below you can see the scripts in text form. Unfortunately, I can hardly report anything about the problem, because I don't understand it and hope for some knowledgeable people :) index.html <!DOCTYPE html> <html lang="en...