protected String processPath(HttpServletRequest request,
        HttpServletResponse response)
        throws IOException {
        String path;
 
        // For prefix matching, match on the path info (if any)
        path = (String) request.getAttribute(INCLUDE_PATH_INFO);
 
        if (path == null) {
            path = request.getPathInfo();
        }
 
        if ((path != null) && (path.length() > 0)) {
            return (path);
        }
 
        // For extension matching, strip the module prefix and extension
        path = (String) request.getAttribute(INCLUDE_SERVLET_PATH);
 
        if (path == null) {
            path = request.getServletPath();
        }
 
        String prefix = moduleConfig.getPrefix();
 
        if (!path.startsWith(prefix)) {
            String msg = getInternal().getMessage("processPath");
 
            log.error(msg + " " + request.getRequestURI());
            response.sendError(HttpServletResponse.SC_BAD_REQUEST, msg);
 
            return null;
        }
 
        path = path.substring(prefix.length());
 
        int slash = path.lastIndexOf("/");
        int period = path.lastIndexOf(".");
 
        if ((period >= 0) && (period > slash)) {
            path = path.substring(0, period);
        }
 
        return (path);
    }