How to Modify Data in a Servlet Response

Question

Hi..
I have a servlet that upon receving an http request from client sends some data to the client browser, but i want to modify the data that is being sent to the client and resend it somehow (like its a kind of bypassing...without sending the original data..i want to modify the data and send the response ON THE FLY.
Any ideas of suggestions how to do it, if some one of you has already done it then pls do send some code snippet.
Thanx in advance
mark.

Answer 1

Aha... now the truth comes out. You asked how to do it, but your secret question was that you were already doing it and you were having some problems. It's generally just better to come out and ask the question, even though it may be embarrassing that what you did isn't working.
To me, what you did sounds like a perfectly good method, except that writing the data to a temp file is going to run you into problems as soon as you get two requests at about the same time. I would do that in memory instead (write to a ByteArrayOutputStream, get the resulting array of bytes, modify it, and write the end result out to the servet response's output stream).
The problem you describe, though, is probably caused because the browsers are caching requests to your servlet. Do you have something like this code in your servlet that tells the browsers not to cache it?response.setHeader("Cache-Control", "no-cache");
response.setHeader("Pragma", "no-cache");