A pipeline for proxying large file uploads

router.ex

defmodule AppWeb.Router do
  use AppWeb, :router

  pipeline :browser do
    plug Plug.Parsers,
      parsers: [:urlencoded, :multipart, :json],
      pass: ["*/*"],
      json_decoder: Phoenix.json_library()

    plug Plug.MethodOverride
    plug Plug.Head

    plug :accepts, ["html"]
    plug :fetch_session
    plug :fetch_flash
    plug :protect_from_forgery
    plug :put_secure_browser_headers
  end

  pipeline :api do
    plug Plug.Parsers,
      parsers: [:multipart, :json],
      pass: ["*/*"],
      json_decoder: Phoenix.json_library()

    plug Plug.Head

    plug :accepts, ["json"]
  end

  pipeline :binary do
    # NOTE: It is important that this pipeline never include
    # Plug.Parsers or it will spool every file to disk
    plug :accepts, ["special-binary-v1"]
  end
end