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Re:Show HN: Send a GitHub webhook to a private URL by Spivak on Wednesday September 21, 2022 @12:09PM (#32927227)
It's totally trivial in almost all setups. Here's Linux.

    ipset create ghwebhooks hash:net
    iptables -A INPUT -m set --match-set ghwebhooks src -m tcp --dport 443 -j ALLOW

    # in /etc/cron.daily
    ipset add ...
    ipset del ...
    ipset list ...
    ipset save >/etc/ipset.conf

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