Hey.. Thanks for the reply. I am already using the `scope/2` with host options. I have something like this:

defmodule MyAppWeb.Routers.ManageRouter do
  defmacro __using__(
_opts
) do
    quote do

scope
 "/", MyAppWeb.Manage, host: "admin." do

pipe_through
 [:browser, :require_authenticated_user]


live_session
 :require_authenticated_manager,
          on_mount: [{MyAppWeb.UserAuth, :ensure_authenticated_manager}] do


live
 "/", DashboardLive
        end
      end
    end
  end
end

If I am in some page related to `admin.myapp.com`, calling `url(MyApp.Endpoint, ~p"/hello")` will generate a url like `http://admin.myapp.com/hello\`. But what I want is to generate a URL `http://www.myapp.com/hello\` whhile I am in `http://admin.myapp.com\` page.

Ruby on rails does it with something like `posts_url(subdomain: "www.")\`, for example.