angularjs – 在Phoenix / Elixir中启用跨源资源共享CORS

我的前端是一个单独的Brunch.io AngularJS应用程序.由于我的前端运行于 http://localhost:3333,而我的凤凰后端运行于 http://localhost:4000,因此在尝试POST到 http://localhost:4000/api/users/register时出现此错误

No 'Access-Control-Allow-Origin' header is present on the requested resource. Origin 'http://localhost:3333' is therefore not allowed access. The response had HTTP status code 404.

所以我认为这是一个CORS问题.如何在凤凰中发送标题？

这是我的router.ex

scope "/api",MyApp do
    pipe_through :api
    # Users
    post "/users/register",UserController,:register
  end

这是我的UserController

defmodule MyApp.UserController do
  use MyApp.Web,:controller

  def register(conn,params) do
    IO.puts(inspect(params))

    conn
    |> put_status(201)
    |> json  %{ok: true,data: params}
  end

end