I’ll revive this old thread because this is almost exactly what I came here searching for. We still have that config_change function in our Application module and it calls Endpoint.config/change but even though the hot deploy works at the Elixir level, the assets are 404-ing.

I understand the basics of the GenServer code_change callback, but I’m having difficulty tracking down advice on how the config_change is supposed to work. I’d appreciate any pointers to more discussion. I assume it’s supposed to be part of the appup file Distillery generates, but I still don’t quite see how the pieces fit yet.