CloudFlare directly forwatd ro kong, resolve host and httponly header

Questions
1

Ok. So i have problems with my httponly. I have used kong behind a nginx. here is the nginx settings:

# HTTPS server block for api.xx.xx
server {
    listen 443 ssl;
    listen [::]:443 ssl;
    server_name api.xx.xx;
    
    ssl_certificate /etc/nginx/cert/xx.pem;  # Use absolute paths
    ssl_certificate_key /etc/nginx/cert/xx.pem;
   # ssl_client_certificate /etc/nginx/cert/origin_ca_rsa_root.pem;
   # ssl_verify_client on;
    ssl_session_cache shared:SSL:10m;
    ssl_session_timeout 10m;
    ssl_protocols TLSv1.2 TLSv1.3;
    ssl_ciphers HIGH:!aNULL:!MD5;
    ssl_prefer_server_ciphers on;

    location / {
        proxy_pass https://127.0.0.1:8443; 
        proxy_set_header Host $host;
        proxy_set_header X-Real-IP $remote_addr;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;

        proxy_set_header Upgrade $http_upgrade;
        proxy_set_header Connection "upgrade";
        proxy_cache_bypass $http_upgrade;
        proxy_http_version 1.1;
        proxy_set_header X-Forwarded-Proto $scheme;

        proxy_cookie_path / "/; secure; HttpOnly";

xxxxx

When i have used this httponly coockie do not work, so either nginx or kong removes it. So i thought maybe we can run kong directly to cloudflare. So i have multiple subs as a records in cloudflare that directs to the same ip. If this is what i want to do, how to get kong to resolve the dns? so it gets the traffic for api.xx.xx?

So two questions here.
With nginx what should I do, i have tried with and without the httponly and a lot of otter settings, no httponly. Or should i run kong directly to the a record?