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Setting the Expires Header in Java Servlet

Posted on 1998-12-17
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Last Modified: 2013-12-25
Can someone please give me the exact Java code to place the expires header in a Java servlet that would make it expire exactly 1 hour from now. Also, how compatible is this header with browsers?

I ask for the exact code because I have code that already does it, I thought, but it doesn't work. Sometimes netscape (perhaps others) will continually re-request to the servlet again and again when I use the code below:

dateNow.setTime( dateNow.getTime() + (1000*60*60) );
res.setHeader( "Expires", dateNow.toGMTString() );
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Question by:taotree
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mouatts earned 400 total points
ID: 1830204
I can't give you the exact java code as I don't particularly know the object that you are using but the format of the header should appear as follows

Expires: Thu, 01 Dec 1994 16:00:00 GMT

If you look at the page info option under view it will tell you what you are actually outputting.

Any web browser that supports HTPP 1.0 should recognise this. However you can effectively override this value within the browser if the 'Check page' setting is set to every time then the browser will not use the cached version even if prior to its expiry date without first going back to the server to establish is the page is out of date.

Steve
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by:taotree
ID: 1830205
I need the Java code because I thought the toGMTString would do it, but it's not working. My concern isn't that they will reload early, but rather they absolutely must not access the cached version after an hour.

In other words, what is an easy standard way in Java to generate that date/time format for 1 hour from the current time?

Perhaps I should post this in the Java category.
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