Adding custom server variables from http module

[Cybermedia Marketing]

I'm trying to convert an ISAPI filter to an httpmodule. The ISAPI filter
added custom headers to the response which could later be accessed by the
asp page.

ISAPI Filter:

pvPrep->SetHeader(pfc, "Instance-Id:", info->instance_id);
pvPrep->SetHeader(pfc, "Company-Id:", info->company_id);
pvPrep->SetHeader(pfc, "Primary:", info->hostname);
pvPrep->SetHeader(pfc, "Profile:", buffer);

These could then be accessed in asp by calling:

Request.servervariables("HTTP_INSTANCE_ID")
Request.servervariables("HTTP_COMPANY_ID")
Request.servervariables("HTTP_PRIAMRY")
Request.servervariables("HTTP_PROFILE")


I've tried adding headers to the response in my httpmodule with the
following code:

_app.Context.Response.AddHeader("INSTANCE-ID", instance_id)
_app.Context.Response.AddHeader("COMPANY-ID", company_id)
_app.Context.Response.AddHeader("PRIMARY", hostname)

and when I view the headers in a tool like wfetch the headers are there but
they can't be accessed thru the servervariables object in the resulting
page.

BTW, I did setup IIS to use the aspnet_isapi.dll to process asp pages.

Anybody have any thoughts or Ideas on how I can make this work or what I'm
doing wrong?

I can't use viewstate or session variables or anything like that due to the
way the original asp app uses these variables.