Insert HTTP headers when accessing a Webtop link

So the user's request goes to your VIP, and gets proxied to backend site? If you add some logging to your irule, do you see anything in the ltm log? Something like:

when HTTP_REQUEST {
    log local0. "URI: '[HTTP::uri]'"
    if { [HTTP::uri] contains "VendorPortal_test"} {
        log local0. "  VenderPortal_Test - Adding headers"

        log local0. "    Adding 'customer': '[ACCESS::session data get session.ad.last.attr.extensionAttribute1]'"
        HTTP::header insert customer "[ACCESS::session data get session.ad.last.attr.extensionAttribute1]"

        log local0. "    Adding 'document': '[ACCESS::session data get session.ad.last.attr.extensionAttribute2]'"
        HTTP::header insert document "[ACCESS::session data get session.ad.last.attr.extensionAttribute2]"
    }         
}

This could help determine if anything actually happening or not.