b.append("type=" + type + ", ");
    public String toString () {        StringBuffer b = new StringBuffer();        b.append("source=" + source + ", ");        for (Iterator it = param.iterator(); it.hasNext(); ) {            RequestParameter rp = (RequestParameter) it.next();            b.append(rp.key + "=" + rp.val + ", ");        }        return b.substring(0, b.length()-2);    }