Ravi Sir's Cards › AWS
CDN cost basics
This revision card explains CDN cost basics. It starts from the need that unexpected bill from high data transfer or bad cache hit ratio. You pay for egress from edge and requests; higher cache hit ratio lowers origin and often cost. The how-to section notes compress, tune TTLs, use Price Class if you can skip costly regions, watch Free Tier carefully. An example on the card is hit ratio rises from 40% to 85% after fixing Cache-Control on images; origin bandwidth drops.
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What this card says
Why do we need it?
Unexpected bill from high data transfer or bad cache hit ratio.
What is it?
You pay for egress from edge and requests; higher cache hit ratio lowers origin and often cost.
hit ratio
How to do it
Compress, tune TTLs, use Price Class if you can skip costly regions, watch Free Tier carefully.
Example
Hit ratio rises from 40% to 85% after fixing Cache-Control on images; origin bandwidth drops.