Dante support both socks(socks4/socks5) and http proxy as upstream proxy.

logoutput: /var/log/sockd.log

internal: 0.0.0.0 port=1080
external: eth0

clientmethod: none
socksmethod: none

user.privileged: root
user.notprivileged: nobody

timeout.negotiate: 30
timeout.io: 86400

client pass {
from: 0.0.0.0/0 to: 0.0.0.0/0
log: connect error
}

socks pass {
from: 0.0.0.0/0 to: 0.0.0.0/0
log: connect error
protocol: tcp udp
}

route {
from: 0.0.0.0/0 to: 0.0.0.0/0 via: HTTP_PROXY_IP port = HTTP_PROXY_PORT
proxyprotocol: http
command: connect
protocol: tcp
method: none
}