Better to use:
<%
/** stop browser from caching, from the Resin FAQ www.caucho.com */
response.setHeader("Cache-Control","no-cache,post-check=0,pre-check=0");
response.setHeader("Pragma","no-cache");
response.setHeader("Expires","Thu,01Dec199416:00:00GMT");
%>
Also, you are going to have problems returning an image (binary) file
from JSP, it is really hard to avoid sending extra whitespace.
Better to use a servlet.
-- Sam
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