Could someone explain what's happening? (pretty long)

This post is similar to the one I have posted earlier. I was hoping someone could explain to me what really is going on in the server.
I have a page where I have a header, left menu, right menu, footer. These are inluded jsp files using the include directive. In the main body I check if the request for the page was a post, do some actions with my beans then redirect to another page. So basically my code looks something like this:
   if (request.getMethod().equalsIgnoreCase("POST")) {
      // do some stuff with my beans
     response.sendRedirect("OtherPage.jsp");
     return; )When I reach the redirect that''s when I get an error: Microsoft Internal error. If I take off the redirect everything works except my user is still left in hte same page. The error occurs while I'm still loading my left menu. My left menu is made up of 2 sections. The first one is the menu options which is generated through JSP, and the second half the links of the site which is plain HTML. So I did a little experimentation. First I tried using the jsp:forward instead of the redirect. Still no go. Then I tried cutting my left menu to the point where I usually get the error, that's the part of the links. So I took of the links in the left menu - the pure HTML part of the menu, and it worked. So I tried generating the links through JSP as well. I got the error again. After researching in the forums I tried increasing the buffer size. A suggestion I saw in previous posts with people with similar problems. I increased the buffer size to 9kb using the <%@ page buffer ="9" %>. It worked. I restored my left menu the way it was before, and thikn s worked fine.
What's bugging me is that my left menu is very simple. It's just has a small background image and some links. The main page is just a simple form as well. I really don't see why there is a need to increase the buffer size. Is my design flawed and inefficient? Or is the need to increase the buffer a common thing in web applications?
I was also thinking could it be that I'm trying to send another response while still processing the current response? I noticed in some sites they do not redirect, instead the just post a page and link to the page where the user has to go. Is my approach wrong? Are you allowed to redirect in the manner I have?
If my design is wrong, what are the other approaches in performing the preocedure? Are there other methods that are more efficient which do not require an increase of the buffer?
I was hoping someone could explain what really is happening behind the scene, so I can decide what is the best approach. This is my first time doing a web application and everything is still new. Hoping to learn from you gurus. Thanks in advance for all the help!

Hi,
Vicky I did uncheck the show user friendly errors and
I still get "an internal error has occured in the
Microsoft internal extensions". Unless I'm doing
something wrong. If it's any help I'm still using ie
5. But I can tell you this, the error is raised while
I'm still in the same page. The page posts to itself
do some validation then redirects. When I hit the
redirect That's when I get the error.It should have shown you the actual Exception,Ibelieve even after unchecking the show user friendly error the response is comming from cache...So now try this Tools-----General---DeleteFiles----AlloffLine files(Check this)....
Now try the response....
As regards to the buffer I tried increasing it to 9kb
instead of the default 8kb and everything worked fine.
Right now what I did with the page is keep the buffer
at it's default 8kb size, it shows some message and
provides a link to direct the user where to go. I
don't think it's a Java exception because I have an
error page that displays the exception and the stack,
and I don't get redirected there. I think it has
something to do with either the buffer and/or creating
another response. Of course I could be wrong, I'm
still trying to figure things out and me being a
newbie and all I'm not getting anywhere.Well,try to access the page directly I mean OtherPage,jsp,which comes from response.sendRedirect.......
Are you allowed to redirect while processing a
response in the first place?Of cource you can....Actually if we see logically once the response is generated at the server it can be send as it is being generated or it can be stored in buffer at the server and then send at one time so the I/o allocations are not held forf the longer times.The default for the jsp is buffered state which can hold 8k,what will happen if the response you are trying to write is more than 8k,it will flush the old storage(check this) can depend on container implementation also....
You get IllegalStateException if the the autoflush=false defined by you....
Can you post the code of the two files let me see.
regards vicky

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