requests to other
        Authorizers.<p>

        An Authorizer application's 200 response may include headers
        whose names are prefixed with <tt>Variable-</tt>.  These
        headers communicate name-value pairs from the
        application to the Web server.  For instance, the response header
<pre>
        Variable-AUTH_METHOD: database lookup
</pre>
        transmits the value <tt>"database lookup"</tt> with name
        <tt>AUTH-METHOD</tt>.  The server associates such name-value
        pairs 