I'm reading this article on Azure CDN. I can either control caching with:

  1. An ETag
  2. Last Modified
  3. Default heuristics

What are the benefits and drawbacks of the first two choices? Does it matter?

Places where one might work vs the other could be:

  • Cross domain calls
  • Private browsing
  • IFrames
  • Ajax

... where that data is either visible by those methods, and not the others.

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