E: The repository 'http://security.debian.org/debian-security buster/updates Release' no longer has a Release file.
N: Updating from such a repository can't be done securely, and is therefore disabled by default.

sudo cp /etc/apt/sources.list /etc/apt/sources.list.backup
sudo nano /etc/apt/sources.list

deb http://archive.debian.org/debian buster main
deb-src http://archive.debian.org/debian buster main

deb http://archive.debian.org/debian-security buster/updates main
deb-src http://archive.debian.org/debian-security buster/updates main

sudo apt update

sudo vim /etc/caddy/Caddyfile

www.114514.com {
         tls aaa@bbb.com
         encode gzip
         reverse_proxy 172.17.0.1:8080
}

systemctl reload caddy