how do I read attributes from headers??

[Sridhar Sripathy]

I tried reading the attributes from headers using this format Request.ServerVariables["HTTP_ATTRNAME"] in and it still does not work.I can see that attrs are mapped correctly because I can see the attributes in the session summary page https://..../Shibboleth.sso/Session
Any info on what is going on between Shibboleth agent and IIS 7 that may be causing these attrs to be dropped out of the headers?
Thanks in advance.
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