类似 rewrite urlaaa urlbbb permanent; 去掉地址栏无用的参数
访问www.abc.com?aa1=123&b2b=&cc=0&dd3=abc&ddr=&d55=a2b&e= 跳转显示为 www.abc.com?aa1=123&cc=0&dd3=abc&d55=a2b
