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Unprepared (in promise) DOMException: Registration error - manifest is empty or missing

I am trying to implement push notification using Polymer. I followed this link and was able to get a service worker registration. I received the following comments on the Javascript console.

Service Worker is ready :^) ServiceWorkerRegistration

But I also got this error.

 Uncaught (in promise) DOMException: Registration failed - manifest empty or missing

Note:

 <link rel="manifest" href="manifest.json">

already in my index.html. Since I use the Google App Engine, in my app.yaml app, I also added the following

 url: /manifest.json static_files: templates/manifest.json upload: templates/manifest.json

And if I try localhost:8080/manifest.json , my json manifest is displayed in the browser. I was not able to get it to work. Kindly provide some help suggestions to check if manifest.json is really available in my index.html

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Source: https://habr.com/ru/post/1244955/

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