Bypass CAS authentication because of a redirect?

On our website, we use the CAS Module to athenticate.

But I need to put in a redirect to pass the visitors to another site first.

But the CAS challenge seems to kick before the redirect takes effect.

How can I bypass?

// rev. 10-06-2014, 10AM
// This code redirects Visitor to Hallways' Welcome page.
// Visitor will authenticate into OMB MAX via Hallways, then get a pass-thru to Navigator site.
// Navigator, because of the CAS Module, will accept the incoming authentication, 
// so the User will already be signed in to OMB MAX when they land on Navigator home page.

<?php
$ref = $_SERVER["HTTP_REFERER"];
if ( $ref == 'https://hallways-dev.fas.gsa.gov/hallways/navtest' )
{
		if (isset($_SESSION['phpCAS']['attributes']['samlAuthenticationStatementAuthMethod'])) {
		 echo "you came from hallways -- defined - you are authenticated in cas - stay here";
		} else {
		echo "you came from hallways -- but -- not defined in cas";
		//header("Location:https://hallways-dev.fas.gsa.gov/hallways/homepage/welcome.html");
		//exit;
		}
}
else
{
header("Location:https://hallways-dev.fas.gsa.gov/hallways/homepage/welcome.html");

}
?>

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sandshakimiAsked:
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Ray PaseurCommented:
If I understand what you're asking for, there is not any succinct and consolidated answer to this question.  This seems to be conceptually similar to advertising networks -- servers with different URLs are able to share data about the client via a network of databases and redirects that are designed to get around the same-origin limitations of cookies and JavaScript.  I'm thinking you might want to learn about DoubleClick and take its designs into account.
http://www.google.com/doubleclick/
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