Request is not available in this context exception when runnig mvc on iis7.5

when i running mvc app on iis7.5 win 7 it cause an exception "Req开发者_如何学Pythonuest is not available in this context" which this don't cause when running by vs2008. can anyone help me?

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I think the answers and notes in my question regarding use of the request object in the global.asax file may be helpful. Are you developing on a system that doesn't use IIS7 by any chance?

Global ASAX - get the server name