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.