. This may be a real problem if the document is sent
          over HTTPS, because most IEx installations will by default
          <em>not</em> cache any content retrieved over HTTPS.
          Setting the <span class="codefrag">Expires</span> header entry may help in
          this case:<br> 
<span class="codefrag">response.setDateHeader("Expires",
          System.currentTimeMillis() + cacheExpiringDuration *
          1000);</span>
<br> Consult your server manual and the
          relevant RFCs for furt