Creating RESTful API using Grape and RABL in Rails 4
  We can create a RESTful API using Grape and RABL in Rails4.   Step 1: Add this GEMS in your Gem file, And do Bundle install.   gem 'grape'   gem 'rabl-rails'   gem 'grape-rabl'   gem 'rack-cors', :require => 'rack/cors'   Step 2: Create a file under lib directory called api.rb, and create a folder inside the view named as api.  # lib/api/v1/root.rb  class API < Grape::API  end   Step 3: Add this line to your application.rb file     config.paths.add "app/api", glob: "**/*.rb"      config.autoload_paths += %W(#{config.root}/lib #{config.root}/app/api/*)       config.middleware.use Rack::Cors do        allow do          origins '*'          # location of your API          resource '/*', :headers => :any, :methods => [:get, :post, :options, :put, :delete]        end      end       config.middleware.use(Rack::Config...