Reading HTTP Request custom Headers

I am working on ASP.NET MVC 2 application. the website runs under SiteMinder (3rd party agent开发者_如何学Go) for authentication. The Siteminder injects custom header to the incoming HTTP request. But when I try to read the custom header, I donot get the value.

System.Web.HttpContext.Current.Request.ServerVariables["CustomKey"];

Looks like these custom headers are getting stripped by MVC. I hav eensured that the headers are for sure getting injected by SiteMinder.

Am I doing anything wrong while reading as shown above?

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You're looking for HttpRequest.Headers, not ServerVariables which represent variables served by IIS to the application:

System.Web.HttpContext.Current.Request.Headers["CustomKey"];

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You you tried using Fiddler Http Proxy agent to verify that custom headers is injected by siteminder in the response header.??