Fencer:
This is the Header that Firebug shows me for the AJAXTableRefresh GET response:

Date         Mon, 23 Feb 2009 19:58:20 GMT
Content-Type    text/xml; charset=utf-8
Pragma	          no-cache
Cache-Control	  must-revalidate, post-check=0, pre-check=0
Expires	          Friday, 12-Jul-02 23:59:59 GMT
Content-Length 309
Server	         Jetty(6.1.9)