phoenix.exs

Application.put_env(:phoenix, :json_library, Jason)
Application.put_env(:sample, SamplePhoenix.Endpoint, [
  http: [ip: {127, 0, 0, 1}, port: 5001],
  server: true,
  secret_key_base: String.duplicate("a", 64)
])

Mix.install([
  {:plug_cowboy, "~> 2.5"},
  {:jason, "~> 1.0"},
  {:phoenix, "~> 1.6"}
])

defmodule SamplePhoenix.SampleController do
  use Phoenix.Controller

  def index(conn, _) do
    send_resp(conn, 200, "Hello, World!")
  end
end

defmodule Router do
  use Phoenix.Router

  pipeline :browser do
    plug :accepts, ["html"]
  end

  scope "/", SamplePhoenix do
    pipe_through :browser

    get "/", SampleController, :index

    # Prevent a horrible error because ErrorView is missing
    get "/favicon.ico", SampleController, :index
  end
end

defmodule SamplePhoenix.Endpoint do
  use Phoenix.Endpoint, otp_app: :sample
  plug Router
end

{:ok, _} = Supervisor.start_link([SamplePhoenix.Endpoint], strategy: :one_for_one)
Process.sleep(:infinity)

@Gazler and anyone who may find this interesting I have ported the script to an Eliixir app.

https://github.com/eksperimental/lean_phoenix_server