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A basic question about "request"

Allan Wang

Joined: Apr 23, 2001
Posts: 20
I was very confused about using "requset" in jsp/servlet program. I think the parameter/values of hidden input field in a form will everytime be submitted to my servlet. But when I press the back button and then submit, in my servlet I get the parameter values which is belong to the page before I push back button. In these two pages, there are the same input field. Who can give me an clarification or some advice or a link?
Thanks very much.
Mahesh Rana
Ranch Hand

Joined: Sep 05, 2001
Posts: 139
The veriables get cached while you switch between the pages.
Simple solution for this problem is write some code for body onLoad which will initialize the variables everytime you load the page.
Another solution is dont let browser cache that page.
You can do it by --
response.setHeader("Cache-Control", "no-cache");
response.setHeader("Expires", "Thu, 26 Sep 1974 06:00:00 GMT");

It is sorta covered in the JavaRanch Style Guide.
subject: A basic question about "request"
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