Feature request: Failover app avanced configuration and GUI
It's more inspired by this discussion https://github.com/TechnitiumSoftware/DnsServer/issues/498 but mostly https://github.com/TechnitiumSoftware/DnsServer/issues/498#issuecomment-1327477115
Right not the Failover app does not support checking for custom HTTP header. It only checks if the HTTP response is 200 OK.
It would be nice to see something like this in GUI

And the protocols

Thanks for the suggestion. The DNS apps currently do not have a support for GUI. There is plan to add GUI feature to the DNS app's design so that each app can use its own html+js to show an GUI to configure it besides having the raw json config option.
This is being given slightly less priority for now as there are some core features that are being requested by many people. So, the DNS apps GUI will come a bit later once a few remaining features are implemented.