Use CakeResponse in Helper.

I would actually suggest creating a view class for this rather than a helper.

Helpers are for helping in the rendering of specific elements, whereas view classes are the best for rendering types of content.

Take a look at my excel plugin to get an idea of a view class. You should be able to easily modify it for your needs. Available at https://github.com/dakota/CakeExcel

@Advantage+ spoken like somebody who hasn't used cake 3.

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