NextCloud cannot connect to subdomain "curl error 7: failed to connect" (AIO behind Caddy proxy)

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Of course. Here you go:

docker-compose.yaml

version: "3.8"

services:
  caddy:
    image: caddy:alpine
    restart: unless-stopped
    container_name: caddy
    volumes:
      - ./Caddyfile:/etc/caddy/Caddyfile
      - ./certs:/certs
      - ./config:/config
      - ./data:/data
      - ./sites:/srv
    network_mode: "host"

  nextcloud:
    image: nextcloud/all-in-one:latest
    restart: unless-stopped
    container_name: nextcloud-aio-mastercontainer
    ports:
      - "8081:8080"
    environment:
      - APACHE_PORT=11000
      - APACHE_IP_BINDING=127.0.0.1
      - SKIP_DOMAIN_VALIDATION=true
    volumes:
      - nextcloud_aio_mastercontainer:/mnt/docker-aio-config
      - /var/run/docker.sock:/var/run/docker.sock:ro
    depends_on:
      - caddy

volumes:
  nextcloud_aio_mastercontainer:
    name: nextcloud_aio_mastercontainer

Caddyfile

https://cloud.domain.com:443 {
    header Strict-Transport-Security max-age=31536000;
    reverse_proxy localhost:11000
}

Caddy logs

{"level":"info","ts":1707126886.9786472,"msg":"using provided configuration","config_file":"/etc/caddy/Caddyfile","config_adapter":"caddyfile"}
{"level":"warn","ts":1707126887.0057113,"msg":"Caddyfile input is not formatted; run 'caddy fmt --overwrite' to fix inconsistencies","adapter":"caddyfile","file":"/etc/caddy/Caddyfile","line":2}
{"level":"info","ts":1707126887.045343,"logger":"admin","msg":"admin endpoint started","address":"localhost:2019","enforce_origin":false,"origins":["//localhost:2019","//[::1]:2019","//127.0.0.1:2019"]}
{"level":"info","ts":1707126887.0456872,"logger":"http.auto_https","msg":"server is listening only on the HTTPS port but has no TLS connection policies; adding one to enable TLS","server_name":"srv0","https_port":443}
{"level":"info","ts":1707126887.0457323,"logger":"http.auto_https","msg":"enabling automatic HTTP->HTTPS redirects","server_name":"srv0"}
{"level":"info","ts":1707126887.0462205,"logger":"tls.cache.maintenance","msg":"started background certificate maintenance","cache":"0xc00026b380"}
{"level":"info","ts":1707126887.0747657,"logger":"http","msg":"enabling HTTP/3 listener","addr":":443"}
{"level":"info","ts":1707126887.0753088,"msg":"failed to sufficiently increase receive buffer size (was: 208 kiB, wanted: 2048 kiB, got: 416 kiB). See https://github.com/quic-go/quic-go/wiki/UDP-Buffer-Sizes for details."}
{"level":"info","ts":1707126887.0758224,"logger":"http.log","msg":"server running","name":"srv0","protocols":["h1","h2","h3"]}
{"level":"info","ts":1707126887.0762637,"logger":"http.log","msg":"server running","name":"remaining_auto_https_redirects","protocols":["h1","h2","h3"]}
{"level":"info","ts":1707126887.0762956,"logger":"http","msg":"enabling automatic TLS certificate management","domains":["cloud.domain.com"]}
{"level":"info","ts":1707126887.2237997,"msg":"autosaved config (load with --resume flag)","file":"/config/caddy/autosave.json"}
{"level":"info","ts":1707126887.2238474,"msg":"serving initial configuration"}
{"level":"warn","ts":1707126887.3623135,"logger":"tls","msg":"storage cleaning happened too recently; skipping for now","storage":"FileStorage:/data/caddy","instance":"8f0dd2c8-3beb-452c-a0c4-86de1c36dcb3","try_again":1707213287.3623066,"try_again_in":86399.999997198}
{"level":"info","ts":1707126887.3630536,"logger":"tls","msg":"finished cleaning storage units"}

Is this sufficient?