Access-list 101 permit ip (source ip block) (subnet mask) (destination ip block) (subnet mask) eq 80
If you are not concerned about detination than you can say
Access-list 101 permit ip any any eq 80
Last statement, which is inherent, denies anything that does not match these. Also please check the exact syntax. Once done you need to call these statements on the interface by using "ip access-group 101" under your interface configuration.
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