How do I append a custom header and then retrieve it?

I am having all kinds of problems with something that should be fairly straight forward and simple.  I want to add a custom header using Request.AppendHeader(name, value) then when the page is displayed be able to get the custom header.  But when I try it I get an error that object not set to instance of object error.  See code below.  Really need help not a link to some other page which doesn't answer the question.  Must have viewed 100 of them.
Here is where I append the header
Response.AppendHeader("ReserveHeader", "navyreserve.navy.mil");              Response.Redirect(sbURL.ToString());
              
  This line throws the error on the page cited in sbURL
string Header = Request.ServerVariables["HTTP_ReserveHeader"].ToString();

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mbartAsked:
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David S.Commented:
What you are trying to do is not possible.  Server-side code, like ASP, is only processed on the server, and client-side JavaScript can't access most HTTP headers.
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mbartAuthor Commented:
Thanks, afraid of that. Will follow-up with another question along the same lines.
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