Potential race condition with ApplicationCache about sw-appcache-behavior HOT 2 OPEN

Just to correct my previous statement to be more accurate: disabling AppCache happens as part of the service worker activation algorithm, described as step 8 in https://w3c.github.io/ServiceWorker/#activation-algorithm. So it's once a registered service worker activates that AppCache is effectively disabled, not immediately following registration.

I would probably not recommend this, but if you did want to go down the path of trying to register a no-op service worker as early as possible, the best way to do it would be:

// Avoid re-registering the no-op service worker if there's
// already a service worker in control of the page.
if (!navigator.serviceWorker.controller) {
  navigator.serviceWorker.register('no-op-sw.js');
}

If there's something about the way your AppCache manifest is set up that would prevent any of the caching operations that need to be performed in init() from succeeding, that would in turn prevent the service worker registration from happening. I'd probably start by hanging a .catch() off of the init() promise chain and if you have some sort of centralizing logging or error reporting, use that to report any exceptions you catch. That might point to the underlying issue.

from sw-appcache-behavior.

I don't think init() will throws an exception. There is an internal try-catch. I checked our logs and I could not find any instances of the error messaged logged in the catch clause.

I am certain that the service worker is conflicting with app cache as I can see the app cache logs in the console while the service worker is registered. Given that it's going to be removed anyway we'll try to disable the app cache on the webview on our android app. Hopefully that will resolve this strange behavior.

in case anyone reads it in the future, there are two erros that I have seen what that happans. There is a 500 error to fetch the appcache.manifest file. And we keep getting a cache updated event.

from sw-appcache-behavior.