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I cringe a little bit whenever someone tries to present caching as simple or straightforward.

I don't see that anywhere in the post. All I saw was "GET"s shouldn't modify state and should be cacheable. That seems perfectly in line with the spec.

The only problem I have with your comment is that REST is not specified, it's a style:

http://en.wikipedia.org/wiki/Representational_state_transfer

I meant the HTTP spec which is where GETs specified.

GET being cacheable/idempotent is part of the HTTP spec, and has nothing to do with REST: http://www.w3.org/Protocols/rfc2616/rfc2616-sec13.html#sec13...

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