How to retrieve the HTTPServletResponse header field in script tag

I'm creating a nonce in Servlet and adding this nonce variable to HTTPServletResponse header field as below:
String randomUUIDString = UUID.randomUUID().toString();
res.addHeader("randomUUIDString", randomUUIDString);

My question is how do i retrieve this header value in the script tag in xslt

login.xsl has the <script randomUUIDString ="${randomUUIDString}" language="JavaScript"/>

I'm using randomUUIDString ="${randomUUIDString}" in the script tag as shown above. Is that the correct way of doing it?