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HTTP caching

Rails >= 3 comes with HTTP caching abilities out of the box. This uses the Cache-Control and E Tag headers to control how long a client or intermediary can cache a page. In a controller action, use expires_in to set the length of caching for that action:

def show
  @user = User.find params[:id]
  expires_in 30.minutes, :public => true
end

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Use expires_now to force immediate expiration of a cached resource on any visiting client

def show
  @users = User.find params[:id]
  expires_now if params[:id] == 1
end

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Ruby on Rails - http caching in ruby on rails- ruby on rails tutorial - rails guides - rails tutorial - ruby rails

HTTP caching

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