Static HTML page in Phoenix

Question

I'm trying to build a JSON backend for Elm. I only want to serve one page - elm.html, one js file - Main.js - and one css file.

I tried following these instructions but there is not enough there to help a complete newbie like me.

So now I have router.ex

  scope "/", JwtExample do
    pipe_through :browser # Use the default browser stack

    get "/elm", RootController, :index
    get "/", PageController, :index
  end


  # Other scopes may use custom stacks.
  scope "/api", JwtExample do
    pipe_through :api

    resources "/users", UserController, except: [:new, :edit]
  end

This controller

defmodule JwtExample.RootController do
  use JwtExample.Web, :controller

  plug :action

  def index(conn, _params) do
    redirect conn, to: "/elm.html"
  end
end

And my files in web/static and priv/static

But when I surf to /elm I get

no route found for GET /elm.html (JwtExample.Router)

Answer 1

OK, so based on psantos answer, I needed to change lib/endpoint.ex to read

  plug Plug.Static,
    at: "/", from: :jwt_example, gzip: false,
    only: ~w(css fonts images js favicon.ico robots.txt elm.html)

Answer 2

Here's a solution that also servers the static page for requests to the root url, ie https://myapp.test/ :

here's a solution that maps a request to the root path to index.html with a short function plug that can be added to your endpoint.ex without involving controllers. It works by defining a short Plug function to change the requested path. My hope is that it's a little faster to to it in the endpoint compared to doing it in a controller.

def redirect_index(conn = %Plug.Conn{path_info: []}, _opts) do
    %Plug.Conn{conn | path_info: ["elm.html"]}
end

def redirect_index(conn, _opts) do
    conn
end

plug :redirect_index

# This is Phoenix's standard configuration of Plug.Static with
# index.html added.

plug Plug.Static,  
    at: "/", from: :phoenix_elm_starter_template, gzip: false,
    only: ~w(css fonts elm.html images js favicon.ico robots.txt)

Note that in production, you would usually deal with static assets at application server layer, possibly not hitting Phoenix at all.