The latest version of Chrome is removing seams by messing with the display of the URL.
This is a bug.
Ooh, this is a tricky scenario. If you decide to redirect all URLs (from, say, a
www subdomain to no subdomain) and you have a service worker running, you’re going to have a bad time. But there’s a solution here to get the service worker to remove itself.
The server-side specifics are for NGINX but this is also doable with Apache.