When configuring a stateful firewall, an outbound rule allowing traffic over port 80 must have a corresponding inbound rule explicitly set to allow responses from servers on the same port.
Stateful firewalls track the state of active connections and dynamically allow traffic back through the firewall if it is a legitimate response to a request made from inside the network. Therefore, there is no need for a corresponding explicit inbound rule for responses to outbound requests, as the firewall will track and permit these related responses.
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What is a stateful firewall?
What does it mean for a firewall to allow 'dynamic' traffic?
What are the differences between stateful and stateless firewalls?