Plug hook to do something before HTTP response is sent (like logging)

plug_router.ex

defmodule MyApp.PlugRouter do
  use Plug.Router
  
  require Logger
  
  plug Plug.Parsers, parsers: [:urlencoded, :multipart, :json],
    pass:  ["*/*"],
    json_decoder: Poison

  plug :match
  plug :dispatch
  
  put "/api/:file" do
    conn
    |> Plug.Conn.register_before_send(fn conn ->
      Logger.info("#{inspect(conn)}")
      conn
    end)
    |> Plug.Conn.put_resp_header("my-header", "something")
    |> send_resp(200, "ok")
  end
end