nginx-proxy-manager/docker/rootfs/etc/nginx/conf.d/include/resolved_proto_map.conf

# Resolve the effective protocol: use X-Forwarded-Proto if set
# (e.g., from proxies like Cloudflare or AWS)
# otherwise fall back to the current scheme.
map $http_x_forwarded_proto $resolved_proto {
    default $scheme;
    ~.+ $http_x_forwarded_proto;
}