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With regard to the REST problem. I’d been mulling over an idea that someone else had suggested but wasn’t convinced it would work well. So, while people are reading could you please give your thoughts on this…
Instead of the script serving the adapted image straight up, it could send a header to say the image has temporarily moved, and ask the browser to request the device-sized url instead.
i.e., instead of sending /480/image.jpg when the page had requested /image.jpg is there any milage in the idea of sending a header back to the browser to say “actually, go download /480/image.jpg” instead. I’m not sure how this would work with proxies and caches.