gistfile1.rb

class CustomerAPI < Grape::API
  version 'v1', :using => :header

  resource :users do
    desc "Will Error!"
    post :silly do
      error("You're silly", 500)
    end

    desc "Smarter version of all Users"
    get do
      users = User.all
      users.empty? ? error("No content", 204) : users.to_json
    end
  end
end