CODEWITHSUNDEEP
javajsphttpcache-control
Sam
Sam

Reputation: 1085

Add an Expires or a Cache-Control header in JSP

How do you add an Expires or a Cache-Control header in JSP? I want to add a far-future expiration date in an include page for my static components such as images, CSS and JavaScript files.

Upvotes: 30

Views: 95560

Answers (4)

User1985
User1985

Reputation: 63

<%
    response.setHeader("Cache-Control", "no-cache"); //HTTP 1.1
    response.setHeader("Pragma", "no-cache"); //HTTP 1.0
    response.setDateHeader("Expires", 0); //prevents caching at the proxy server
%>

Upvotes: 2

BalusC
BalusC

Reputation: 1109252

To disable browser cache for JSP pages, create a Filter which is mapped on an url-pattern of *.jsp and does basically the following in the doFilter() method:

HttpServletResponse httpResponse = (HttpServletResponse) response;
httpResponse.setHeader("Cache-Control", "no-cache, no-store, must-revalidate"); // HTTP 1.1
httpResponse.setHeader("Pragma", "no-cache"); // HTTP 1.0
httpResponse.setDateHeader("Expires", 0); // Proxies.

This way you don't need to copypaste this over all JSP pages and clutter them with scriptlets.

To enable browser cache for static components like CSS and JS, put them all in a common folder like /static or /resources and create a Filter which is mapped on an url-pattern of /static/* or /resources/* and does basically the following in the doFilter() method:

httpResponse.setDateHeader("Expires", System.currentTimeMillis() + 604800000L); // 1 week in future.

See also:

Upvotes: 73

mp31415
mp31415

Reputation: 6689

Servlet containers like Tomcat come with a set of predefined filters. See for example Expires Filter. It may be easier to use existing one than to create your own similar filter.

Upvotes: 1

Darin Dimitrov
Darin Dimitrov

Reputation: 1039180

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

Upvotes: 10

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