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At Facebook scale, the sum of all those "304 Not Modified" responses is probably a significant amount of resources.



I'm not sure it's a good argument to take up the biggest companies and then tally up effects of a micro improvement. You could argue for all kinds of complexity increasing changes resulting in %0.01 efficiency improvements this way.


At my company, 304s account for 3% of our CDN requests.


304 requests are so tiny that you probably end up in the order of 0.01%.


Very few entities operate at "facebook scale".


But they still account for a lot of the Web traffic.




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