Bookmark this tutorial

If you like our site please bookmark this and help us


Bookmark and Share

Prevent caching of JSP/Servlet output

In this example I will show you how to prevent caching of JSP/Servlet output using Cache-Control HTTP header.

Set Cache-Control header to prevent browser caching.

Browser caching can be disable by setting HTTP 1.1 Cache-Control header as shown below. 

response.setHeader("Cache-Control", "no-cache");

Prevent caching of JSP output

Put following scriptlet at the beginning of the JSP to prevent output caching

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

it is always good to set Pragma header too, in case HTTP 1.0 is used.

Prevent caching of Servlet output

	protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
 
		response.setHeader("Cache-Control","no-cache"); 
		response.setHeader("Pragma","no-cache");
		response.setDateHeader ("Expires", 0);
 
	}

References

Caching in HTTP
HTTP/1.1Header field definitions
List of HTTP headers