Frankly, it would be difficult to find a part of your post that is correct. 1. You're never causing their server to do anything they didn't configure their ser

Frankly, it would be difficult to find a part of your post that is correct. 1. You're never causing their server to do anything they didn't configure their server to do. Accept headers are merely information for the server telling them what you can accept: what they return to you is their choice, and they can weigh the tradeoffs themselves. 2. The tradeoff you think is happening isn't even happening in a lot of cases. In a lot of cases they'll be serving that up from a cache of some sort so the CPU work has already been done when someone else requested the page. CPU versus bandwidth isn't an inherent tradeoff.