add support for http://localhost:8080/vid/key_cookie or http://localhost:8080/vid/key_cookie.txt
add support for http://localhost:8080/vid/key_cookie
or
http://localhost:8080/vid/key_cookie.txt
chrislusf/seaweedfs,k85169336/seaweedfs,chrislusf/seaweedfs,k85169336/seaweedfs,hxiaodon/seaweedfs,chrislusf/seaweedfs,chrislusf/seaweedfs,hxiaodon/seaweedfs