redirect 80 to 8080 on macOS

\etc\pf.conf

...
rdr-anchor "com.apple/*"
rdr pass on lo0 inet proto tcp from any to port 80 -> 127.0.0.1 port 8080
rdr pass on en0 inet proto tcp from any to port 80 -> 192.168.1.9 port 8080
...

\Library\LaunchDaemons\com.pf.plist

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE plist PUBLIC "-//Apple Computer/DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
    <key>Label</key>
    <string>com.pf.plist</string>
    <key>Program</key>
    <string>/sbin/pfctl</string>
    <key>ProgramArguments</key>
    <array>
        <string>/sbin/pfctl</string>
        <string>-e</string>
        <string>-f</string>
        <string>/etc/pf.conf</string>
    </array>
    <key>RunAtLoad</key>
    <true/>
    <key>ServiceDescription</key>
    <string>FreeBSD Packet Filter (pf) daemon</string>
    <key>StandardErrorPath</key>
    <string>/var/log/pf.log</string>
    <key>StandardOutPath</key>
    <string>/var/log/pf.log</string>
</dict>
</plist>