iPurpl3x make sure you add the middleware to the correct stack(s). In the extension above it's the forum stack because it has to redirect the homepage, but it has to be added separately for the API I believe.
If you added it to the API stack but the OPTIONS request is done to /, you'll need to add your middleware to both stacks.
If the above is correct, what path is used and what response do you get from the OPTIONS request ? A RouteNotFound or MethodNotAllowed from Flarum, or something else ?
