How Can I Display Custom HTTP Content in FCC File?

Document ID : KB000117164
Last Modified Date : 09/10/2018
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We want to display the content of a custom HTTP header in an FCC file after an OnAccessReject (global) policy.
The header is set by a global Response Webagent-HTTP-header variable and adding the new header to the FCC namespace using @smheaders directive doesn't work. 

How can we get this to work?
SSO 12.52.x 
Your query would not work because OnAccessReject, the user is redirected to another page. Even though it is a 302 redirect to the login.fcc, the headers will not be available as this would be a new request.