Blocking video files with rep_mime_type video/x-flv

There several type of video file formats. One of them is fllv : format used by streaming video service such as youtube, metacafe, etc

We are going to block thise file.The configuration file is :

acl LOCALHOST src 127.0.0.1
acl LOCALNET_A src 192.168.0.0/24
acl FORBIDDEN_DESTINATION dstdomain "/etc/squid3/restricteddomains.txt"
acl FORBIDDEN_VIDEO rep_mime_type video/x-flv

http_access deny FORBIDDEN_DESTINATION
http_reply_access deny FORBIDDEN_VIDEO

http_access allow LOCALHOST
http_access allow LOCALNET_A

http_port 3128