Live reload middleware for ember-cli

live_reload_middleware.rb

# Mostly copied from http://stackoverflow.com/questions/11057905
class LiveReloadMiddleware < Rack::Proxy
  def initialize(app)
    @app = app
  end

  def call(env)
    # call super if we want to proxy, otherwise just handle regularly via call
    (proxy?(env) && super) || @app.call(env)
  end

  def proxy?(env)
    Rack::Request.new(env).path == "/ember-cli-live-reload.js"
  end

  def rewrite_env(env)
    env["HTTP_HOST"] = "localhost:4200"
    env
  end
end