Is th开发者_StackOverflow社区ere a way to have a HttpCache shared between process?
What you're looking for is an out-of-process cache. Most (all?) of them are distributed. See this question for a list of available distributed caches usable in ASP.NET.
Check out Windows Server AppFabric
http://msdn.microsoft.com/en-us/windowsserver/ee695849.aspx
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