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Originally Posted by SMHarman
There are some well formatted caches and browsers out there. Looking at my site stats about 25% of traffic is 304'd. That saves me a good bit in bandwidth costs.
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Absolutely, and if you specify explicit expiry times e.g. by using a header such as:
Cache-Control: max-age=3600
on appropriate images etc. then it optimises your web performance even further since the browsers/caches will know exactly when to refresh the content and won't need to guess by sending periodic IMS requests.
For instance Google's logo.gif expires in Jan 2038! Of course if they want to change it then they just change the name.