Socket won't connect to Endpoint

Question

var socket = new Socket("localhost:4000")
socket.connect()

Returns WebSocket connection to 'ws://localhost:4000/ws' failed: Error during WebSocket handshake: Unexpected response code: 404

But I do have the socket on the /ws endpoint, right?

defmodule Sapphire.Endpoint do
  use Phoenix.Endpoint, otp_app: :sapphire

  socket "/ws", Sapphire.MomentSocket

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

  if code_reloading? do
    socket "/phoenix/live_reload/socket", Phoenix.LiveReloader.Socket
    plug Phoenix.LiveReloader
    plug Phoenix.CodeReloader
  end

  plug Plug.RequestId
  plug Plug.Logger

  plug Plug.Parsers,
    parsers: [:urlencoded, :multipart, :json],
    pass: ["*/*"],
    json_decoder: Poison

  plug Plug.MethodOverride
  plug Plug.Head

  plug Plug.Session,
    store: :cookie,
    key: "_sapphire_key",
    signing_salt: "hW1bFEcR"

  plug Sapphire.Router

end

It should be able to connect to that endpoint, but for some reason it can't reach it at all.

[info] Running Sapphire.Endpoint with Cowboy on http://localhost:4000

Answer 1

@JoséValim found the solution.

I was porting the phoenix.js library to coffeescript and missed the fact that the suffix of the path should be whatever the transport layer is. In this case, it needed /websocket at the end in the implementation. :)