No transform a cash control header tells anintermediary seden not to mess with the original files. Cloud flier will try to compress your images without actually changing them. If you are on the client and you need to specifically ask the server for a version of something, you can pop a no cash header on there. You can specificaly overrite max age, max stale and min fresh headers as well.
In this Hasty Treat, Scott and Wes answer a question about caching, cache control headers, an explanation of the fields for caching.
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