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IIS caching does not work

I turned on caching in IIS 6 for all of our static images and CSS (by right-clicking on these folders in IIS and turning on Content Exiration after 30 days in the HTTP Headers section ).

When I launch Google PageSpeed ​​and look at the resources tab, the state of these images and css is displayed as 200, but I was expecting 304 (has not been changed). When I checked Yahoo.com on Pagespeed, all of its images have a status of 304. So, my caching does not work? or this is how IIS content expiration works.

Any help would be appreciated.

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Source: https://habr.com/ru/post/1736588/

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