在Rails 4 application.rb中为多个域设置“ Access-Control-Allow-Origin”

Question

在我的Rails应用中，我将CORS设置为allow http://someurl.com。允许多个域的语法是什么？

我当前的配置 application.rb

    config.action_dispatch.default_headers = {
        'X-Frame-Options' => 'ALLOWALL',
        'Access-Control-Allow-Origin' => 'http://someurl.com', # How can I add "anotherurl.com" to this list?
        'Access-Control-Allow-Credentials' => 'true',
        'Access-Control-Allow-Methods' => 'POST GET'
    }

指南中未提及语法：http : //edgeguides.rubyonrails.org/configuring.html