Cannot get a correct callback_url for a forwarded request

[secretworry]

After I tried to forward the request to my controller handing the auth logic as below,

scope "/", Example do
    forward "/auth", AuthController
end

In the AuthController, I wouldn't be able to get a correct callback_url with the \auth prepended.

I think the reason is that when generating the callback_url, the script_name in Plug.Conn doesn't get considered.

[secretworry]

I just noticed that the ueberauth is routed with request_path, i.e. doesn't support forward.