I got a React application and a Spring Boot application which works very well on the same server with one on port 8080 and other on 3000 but when I try to add SSL certificate to nginx it doesn’t accept my requests but it works well on http and I can access to the application via server IP so how can I install SSL certificate gotten from LetsEncrypt to my server ?

server {
    listen 80;
    server_name ######;

    location / {
        root /var/www/appFrontend; 
        try_files $uri /index.html;
    }

    location /api/ {
        proxy_pass http://127.0.0.1:8080/;
        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 X-Forwarded-Proto $scheme;
        proxy_redirect off;
    }
}

It works well with a config like this but on http. I also user spring security for the backend it may cause the problem also because it works well with http but when I change to https then it gives me the 403 Forbidden error and it also produces pre-authenticated entry point error.