Caddy configuration for mastodon (for my own instance) (ripped off from https://gist.github.com/yukimochi/bb7c90cbe628f216f821e835df1aeac1)

Caddyfile

https://social.amnesiak.org {
    log  /var/lib/caddy/data/social.amnesiak.org-access.log
    errors /var/lib/caddy/data/social.amnesiak.org-access.err
    
    root /data/mastodon/public

    gzip

    header / {
        Strict-Transport-Security "max-age=31536000;"
    }

    header /emoji Cache-Control "public, max-age=31536000, immutable"
    header /packs Cache-Control "public, max-age=31536000, immutable"
    header /system/accounts/avatars Cache-Control "public, max-age=31536000, immutable"
    header /system/media_attachments/files Cache-Control "public, max-age=31536000, immutable"

    errors {
        * 500.html
    }

    rewrite {
    if {path} is /
    to /proxy{path}
    }

    rewrite {
        if {path} not_has /api/v1/streaming
        to {path} /proxy{path}
    }

    proxy /proxy localhost:3000 {
        without /proxy

        transparent
        websocket
    }

    proxy /api/v1/streaming localhost:4000 {
        transparent
        websocket
    }

    tls {
        protocols tls1.2
    }
}