Case -1
If u do not set the expiry header for these .js they will be checked from the
server for freshness.
In this case only HTTP header interchange takes place between the client and
th server.

Case - 2

If u set the expiry date to some future date ( Through some http1.1 compliant
server)  , then the browser does not at all go to the server to take these
files.

    This is the best option.

    To overcome the diffiuculty of  propagating the newer versions, do this.
    Say iu have a class  Global.java, Have as static final int property
"Version"  .
    In the .jsp  use  <script language='javascript' src='file1.js&Version=<%
Global.Vesion %>'></script>
  Now every time a change in .js, increment the value of Version in .js copile
and then deploy.

Case-3

If u want the page shoud never cache then use this in the HTML HEAD tag

	<%
	response.setHeader("Pragma","No-Cache");
	response.setDateHeader("Expires",0);
	response.setHeader("Cache-Control","no-Cache");
	%>










Thanks and Regards
Raj
EXT 6146



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