How to know when the request is forwarded in a RequestWrapper object

Question

I am using a subclass of HttpServletRequestWrapper to do some translations on the request parameters, and I cache the translated values the first time they are

Answer 1

The original request URI is available as request attribute with the key RequestDispatcher.FORWARD_REQUEST_URI.

String originalRequestURI = request.getAttribute(RequestDispatcher.FORWARD_REQUEST_URI);

if (originalRequestURI != null) {
    // It was forwarded. Now get the query string as follows.
    String originalQueryString = request.getAttribute(RequestDispatcher.FORWARD_QUERY_STRING);
}

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Note: in older Servlet API versions you need to hardcode the key instead.

String originalRequestURI = request.getAttribute("javax.servlet.forward.request_uri");
// ...