Cannot access webserver's page and get ERR_SSL_PROTOCOL_ERROR

[albertopasqualetto]

Describe the bug

Cannot access webserver's page and get ERR_SSL_PROTOCOL_ERROR

Screenshots or Logs

Additional context

I am using caddy-docker-proxy as reverse proxy, I followed the guide from uptime-kuma and also it works if I use localtunnel.

This is the relevant part of my docker-compose.yml:

  epicgames-freegames:
    container_name: epicgames-freegames
    image: charlocharlie/epicgames-freegames:latest
    volumes:
      - ~/epicgames-freegames/:/usr/app/config:rw
    ports:
      - 3000:3000
    shm_size: '2g'
    networks:
      - caddy
    labels:
      caddy: epicgames.*******
      caddy.reverse_proxy: "{{upstreams 3000}"
      # Also tried without the following directives
      caddy.reverse_proxy.transport: http
      caddy.reverse_proxy.transport.tls:
      caddy.reverse_proxy.transport.tls_insecure_skip_verify:

This is the relevant part of my config.json:

	"webPortalConfig": {
		listenOpts: {
			port: 3000,
		},
		"baseUrl": "https://epicgames.******"
	},

I understand that it is a problem on my side, but I am not able to resolve.