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So in the response header it will say nothing about the images that are being compressed? Images are compressed by default by what layer? IIS? F5? Application?. What is the most convenient way to find out if images are being compressed without using tools such as webpagetest tool?

Thanks.

Regards,
TRX
No, there are no headers because the image files themselves are already compressed when they were originally saved. By definition, ALL images are compressed, the main question is if they are "compressed enough". You can only check that with tools that were designed for checking images (WebPagetest and Zoompf are the only ones I know of that check jpeg's for lossy compression).

If you have a publishing system then you can build checks into that but it's usually just done by policy - telling any editors to always save at "photoshop quality level 50" for example.
trx Wrote:Images are compressed by default by what layer?

Normally, images are compressed by image editing software (such as PhotoShop, etc) before you upload them to your server. Normally, there is no further compression done to images by the server.
Makes perfect sense. Thank for everyone's help.

Regards,
TRX
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