My PWA web app keep showing old version after a new release on Safari (but works fine on chrome)? : <p>I added PWA and service worker to my existing web app based on Angular 5. Everything looks fine on first release. However, when I try to release updates, something strange is happening.</p>

<p>On PC using Chrome, I don't have problem. After each release, I got an alert asking me to update for a new version, which is great.</p>

<p>However, this alert is missing on iOS, which is probably okay because iOS doesn't support auto update yet as I understand it. If I use Chrome on iOS, I can get the new version after manually refresh it (sometimes it takes a few refreshes). However, Safari browser doesn't normally show the new version. If I keeps refreshing the page, the new version comes up eventually, but it falls back again after I close and reopen it. As I play around, the only way I get to the new version is to manually clear the Safari cache first. This is not acceptable to regular user.</p>

<p>I understand iOS has limited support of PWA, but is this the most what we can get on iOS? Without the auto update, how can an iOS user know of the new release and update it? </p>
