rails 项目，支持angular时，做allow - domain - 的设置

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参考： http://stackoverflow.com/questions/29751115/how-to-enable-cors-in-rails-4-app 
add to your Gemfile:

gem 'rack-cors'
Add below code to config/application.rb

# Rails 3/4
config.middleware.insert_before 0, "Rack::Cors" do
  allow do
    origins '*'
    resource '*', :headers => :any, :methods => :any
  end
end

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