redircert traffic to a specific resource using HTTP:HEADER

You should be able to do this with an iRule. This is similar to what we've done.

when HTTP_REQUEST {
    if { [ACCESS::policy result] equals "allow" } {
        if { [HTTP::header exists "HEADER_NAME_1"] } {
             Use ([HTTP::header value "HEADER_NAME_2"] equals "WHAT_YOU'RE_LOOKING_FOR") if you need to check value instead of existence

             This will send a redirect to the user to go to the webtop page. You'll just need to specify the webtop name in the URL
            HTTP::respond 302 Location "/vdesk/webtop.eui?webtop=/Common/WEBTOP_NAME_1&webtop_type=webtop_full"
            return
        } elseif { [HTTP::header exists "HEADER_NAME_2"] } {
             Use ([HTTP::header value "HEADER_NAME_2"] equals "WHAT_YOU'RE_LOOKING_FOR") if you need to check value instead of existence

             This will send a redirect to the user to go to the webtop page. You'll just need to specify the webtop name in the URL
            HTTP::respond 302 Location "/vdesk/webtop.eui?webtop=/Common/WEBTOP_NAME_2&webtop_type=webtop_full"
            return
        }
    }
}

This will work if the client is already logged in and submits new http request. However, if you're trying to grab the header for right after they authenticate, that's a little more complicated. If you need help with that instead, let me know and I'll help with something a little more robust.