Running an existing Flutter app on Web

My starting point was On the main page, I clicked on "web", went to, then to

The requirements say that you have to be on the beta branch:

flutter channel beta
flutter upgrade
flutter config --enable-web

Then you add support for it like so:

flutter create .

Finally I tried running it by pressing Option+F5 in Visual Studio Code. It then asked me to allow `http://[::1]:63105/`. Even though I said yes, the Chrome tab crashed, failing to load the service worker. At the same time, VSC showed me this spinner:

I found the same issue reported here:

It seems that running it from the command-line as explained in the docs works, so I'll stick to that for now:

flutter run -d chrome