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Error Redirection w/Params?

 
Greenhorn
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Hi,
I'm trying to set up a web application so that all kinds of server errors (400, 401, 403, 404) redirect to a single JSP. My idea was the following, in web.xml, we can specify how redirection is supposed to happen, right? Like so:
<web-app>
<error-page>
<error-code>404</error-code>
<location>/jsp/error.jsp?ec=404</location>
</error-page>
</web-app>
My reasoning was that I could just add ?ec=404 to the URL and then read the request object's "ec" parameter from within /jsp/error.jsp. This isn't working, for some reason. Does doing redirection in this way invalidate the request object? Is there some other way of redirecting multiple errors to one page, then figuring out which is which on the page?
Thanks,
Greg D
 
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