[SQU] access lists help

I am useing this in my squid.conf file, it works, allows access to all,
but then I add a deny acl, nothing happens, noone gets denied....I am
confused regarding the acl's ...can anyone shed some light? thanks

acl all src 0.0.0.0/0.0.0.0
acl discflo src 192.168.0.0/255.255.255.0

http_access deny all
http_access allow discflo

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