generate_204 is used to check if a network has internet connection or need to login at captive portal, not sure about Fuchsia but on Android if you don't want to use google server for that, you can disable the feature or change it to use a different url
https://android.stackexchange.com/questions/186993/captive-p...
Apple and Microsoft both have something similar but with their own website, and AFAIK there's no way to change the url on iOS.
Apple and Microsoft both have something similar but with their own website, and AFAIK there's no way to change the url on iOS.