How to display all HTTP headers

        Enumeration names = ((HttpServletRequest)request).getHeaderNames();
        StringBuffer result = new StringBuffer("");
        String value = null;
        while (names.hasMoreElements()) 
        {
            String name = (String) names.nextElement();
            Enumeration values = ((HttpServletRequest)request).getHeaders(name); 

            if (values != null) 
            {
                while (values.hasMoreElements()) 
                {
                    value = (String) values.nextElement();
                    result.append(name + ": " + value + "\n<br>");
                }
            }
        }
        System.out.println("BEGIN: all headers" + eol );
        System.out.println( result.toString() );
        System.out.println("END: all headers" + eol );