/include/image.class.php里可以增加后缀格式下载，但现在很多图片没有后缀，请问下老大要怎么修改？感谢！

图片地址如：https://img04.sogoucdn.com/v2/thumb/resize/w/200/h/420/t/0/retype/ext/auto/q/75?appid=200839&url=http%3A%2F%2Fimg02.sogoucdn.com%2Fapp%2Fa%2F200803%2F3a91b447aa485d177e1c4aad22acf031