ponse.setDateHeader("Expires",
          System.currentTimeMillis() + cacheExpiringDuration *
          1000);</span>
<br> Consult your server manual and the
          relevant RFCs for further details on HTTP headers and
          caching.
        </li>
        
<li>
          Cache in the server. It may help to include a parameter in
          the URL which has a timestamp as the value min order to
          decide whether a request is repeated. IEx is reported to
          retrieve a document up to three