caddy crowdsec article related question

[dense fog]

so i was checking this
https://www.crowdsec.net/blog/secure-caddy-crowdsec-remediation-waf-guide

as am trying to build my own proxy image to use in coolify with crowdsec.

but it states to build caddy with the following

xcaddy build \
    --with github.com/mholt/caddy-l4 \
    --with github.com/caddyserver/transform-encoder \
    --with github.com/hslatman/caddy-crowdsec-bouncer/http@main \
    --with github.com/hslatman/caddy-crowdsec-bouncer/appsec@main \
    --with github.com/hslatman/caddy-crowdsec-bouncer/layer4@main

am a little confused why do we have
github.com/mholt/caddy-l4 and github.com/hslatman/caddy-crowdsec-bouncer/layer4@main

does each serve a different purpose ?

[dreamy ferry]

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