configure for setting auto run livebooks

[Ljzn]

Hello! I'm using livebook as a simple test web server, by running on embedded mode, and updating current cowboy routers. The pages can be visited and updated in realtime. For example:

defmodule TestHandler do
  @behaviour :cowboy_handler

  def init(req, state) do
    resp =
      :cowboy_req.reply(200, %{}, "hi", req)

    {:ok, resp, state}
  end
end

dispatch =
  :cowboy_router.compile([
    {:_, [],
     [
       {'/test', [], TestHandler, %{}},
       {:_, [], Phoenix.Endpoint.Cowboy2Handler, {LivebookWeb.Endpoint, []}}
     ]}
  ])

:cowboy.set_env(LivebookWeb.Endpoint.HTTP, :dispatch, dispatch)

I'm not sure is it a recommended way to use livebook, but it is a easiest way to setup a test server. It would be nice if there is a configure to let a book be executed after node started, as I don't need to worry about node restarting.

[jonatanklosko]

Hey @Ljzn! Can you please give more context on what do you use that server for? Also, instead of injecting into Livebook router you could start a new endpoint on a different port?