implemented isRedirect/isPermanentRedirect
implemented isRedirect/isPermanentRedirect

sunfei/Just,JustHTTP/Just,msdgwzhy6/Just,msdgwzhy6/Just,jianwoo/Just,jianwoo/Just,alvinvarghese/Just,sunfei/Just,f22x/Just,alvinvarghese/Just,sunfei/Just,alvinvarghese/Just,f22x/Just,f22x/Just,JustHTTP/Just,msdgwzhy6/Just,jianwoo/Just