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Led by this comment in a previous question:
Portlet: Forward a ResourceRequest to show the full portal
I was wondering if the best way to generate a dynamic download from a portlet (Like, for example, a dynamically generated PDF or image), is making a ResourceRequest, or if there is a better alternative approach
The purpose of ResourceRequests and the serveResource method is to offer a way to serve resources or content fragments. So, yes, using ResourceRequests is a valid way to dynamically create and serve things like PDFs or images.