how to prevent caching

[giang nguyen]

I use the following meta tags in my jsp file to prevent browser from caching
<meta http-equiv="Pragma" content="no-cache">
<meta http-equiv="Cache-Control" content="no-cache">
But it doesn't work. Some times, the browser keep displaying the old page.
Does any one can help ? I use session to store some shared data. Some time different users's session data is even mixed up. This is particularly frequent with ie 5.x. For i.e 6.x this rarely happens.
Note: I use websphere app server 4.05.
thanks alot

[Dave Cronin]

One possibility, if your network has a proxy server or firewall, the webpage is being cached on the proxy server. The browser cache-control would have no effect in the intermediate proxy server.

[Mani Ram]

Try this. Setting the HTTP Header is more effective than using META tags.

response.setHeader("Cache-Control","max-age=0");
response.setHeader("Pragma","no-cache");
response.setDateHeader("Expires", 0); //prevents caching at the proxy server

[giang nguyen]

Originally posted by R Manivannan:
Try this. Setting the HTTP Header is more effective than using META tags.

response.setHeader("Cache-Control","max-age=0");
response.setHeader("Pragma","no-cache");
response.setDateHeader("Expires", 0); //prevents caching at the proxy server

That's great. It's true that my server is behind a proxy server. When i try your solution it works.
Many thanks