CSRF token verification failed and Session invalid

Solution:

Set upstream headers in Caddy config.

reverse_proxy * 192.168.x.x:8080 {
	header_up Host {http.request.host}
	header_up X-Real-IP {http.request.remote}
	header_up X-Forwarded-For {http.request.remote}
	header_up X-Forwarded-Proto https
	header_up X-Forwarded-Ssl on
}