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That is exactly what cloudinary does as part of their optimized delivery.

https://cloudinary.com/documentation/image_optimization#auto...

Also, your claim is that you are "first to support", not "first to serve all our clients images as jxl without asking if thats ok"...

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It still needs `f_jxl` in parameter. Automatic support has still not launched as per this article's last paragraph: https://cloudinary.com/blog/jpeg-xl-how-it-started-how-its-g...

The "automatic support" you mention there is for the AI optimization, which decides which format to use based on the image content. It is unrelated to the client detection.

You dont need to use the f_jxl parameter. e.g. https://res.cloudinary.com/demo/image/upload/c_scale,w_500/f...

And can all be handled via srcset.

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