Thanks for your above post, it is useful for me. However I'm not able to find any form on my page. I used all form options available with www::mechanize. The page is jsp page and the only form tag available in source code is as mentioned below.

       <form action="html" method="post">
            <input type="submit" name="clearAllCaches" value="Clear Al
+l Caches" style="margin:1em;" />
        </form>
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