A mysterious issue arose while trying to retrieve the script (Service Worker)

After disconnecting from the internet, my service worker is generating the following error:

(unknown) #3016 An unknown error occurred when fetching the script

This is what my service worker code looks like:

var version = 'v1'

this.addEventListener('install', function(event){
  event.waitUntil(
     caches.open(version).then(cache => {
       return cache.addAll([
         'https://fonts.googleapis.com/icon?family=Material+Icons',
         'https://fonts.googleapis.com/css?family=Open+Sans:400,600,300',
         './index.html'
       ])
     })
   )
})

this.addEventListener('fetch', function(event) {
  event.respondWith(
    caches.match(event.request).then(function(resp) {
      // if it's not in the cache, server the regular network request. And save it to the cache
      return resp || fetch(event.request).then(function(response) {
        return caches.open(version).then(function(cache) {
          cache.put(event.request, response.clone())
          return response
        })
      })
    })
  )
})

The service worker file is located at the root directory, alongside a manifest that is imported in index.html like this:

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

I import the service worker in my entry js file. And register it right after.

require('tether-manifest.json')
import serviceWorker from 'sw'

if ('serviceWorker' in navigator) {
  navigator.serviceWorker.register(serviceWorker)
  .then(() => {
    // registration worked
  }).catch(error => {
    throw new Error(error)
  })
}

The registration process goes smoothly, the error only occurs when going offline.

I am using webpack with React, and the following configuration is used to copy my sw.js file to the dist folder:

loaders: [
      { // Service worker
        test: /sw\.js$/,
        include: config.src,
        loader: 'file?name=[name].[ext]'
      },
      { // Manifest
        test: /manifest\.json$/,
        include: config.src,
        loader: 'file?name=[name].[ext]'
      }
]

The error message does not provide any insight into the cause of the issue.

Does anyone have suggestions on how to resolve this?

Answer №1

After struggling for an hour with a perplexing issue, I finally discovered that the culprit was a lingering additional tab from the same origin that had been left open. This tab had the "Offline" checkbox activated, preventing other tabs from requesting sw.js for some unknown reason.

Evidently, the offline status of one tab was affecting the Service Worker scope and not being properly managed by other tabs that were not initially put into Offline mode.

To avoid this issue, ensure that no other clients are utilizing the same Service Worker. You can check for them under DevTools > Application > Service Workers.

Answer №2

I was able to resolve this error by including sw.js in the cache during installation. It was a simple step that I had overlooked, but it successfully fixed the problem.

Answer №3

First and foremost, make sure to double-check if your https certificate is valid or matches the URL you are trying to access.

For example, in a scenario where I attempted to visit https://localhost using a certificate issued for a different domain.

Even though clicking "proceed" allowed me to proceed to the site, the following error message would be displayed in the console:

An unknown error occurred while fetching the script

Answer №4

During my time working on a project with Angular, I encountered a specific issue. The problem stemmed from my reliance on the ng serve -prod command offered by Angular CLI.

To resolve this issue, I switched to utilizing ng build -prod and subsequently deployed the resulting dist folder through an http-server.

Answer №5

When using Google Chrome, I solved the issue by selecting the Bypass for network option and then successfully reloading the page.

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