iam using the apache tomcat server web application (JAVA-JSP page) and am using Nginx current version

problem is while using 80 port all the get and post method work but I install letsencrypt SSL certificate using cerbot…am sure all the SSL stuff I have done correctly…

i have JSP file and inside WEB-INF/lib/myfile.jar

on myfile.jar also having JSP page and some lib file like MySQL connector, servlet....etc

when post-action performs its getting like 403 access permission denied but it can work in 80 port

http {
  server {
        server_name server_name.com;
        root /var/lib/tomcat9/webapps/ROOT/;

        index index.jsp;
        location / {
            proxy_set_header   X-Real-IP $remote_addr;
            proxy_set_header   Host      $http_host;
            proxy_pass         http://127.0.0.1:8080;
        }
    return 301  https://$host$request_uri;
        }
server {
    server_name demo.mydomain.com;

     listen 443 ssl; # managed by Certbot
    ssl_certificate /etc/letsencrypt/live/demo.mydomain.com/fullchain.pem; # managed by Certbot
    ssl_certificate_key /etc/letsencrypt/live/demo.mydomain.com/privkey.pem; # managed by Certbot
    include /etc/letsencrypt/options-ssl-nginx.conf; # managed by Certbot
    ssl_dhparam /etc/letsencrypt/ssl-dhparams.pem; # managed by Certbot

      location / {
        #proxy_set_header content-type "application/json";
            proxy_set_header   X-Real-IP $remote_addr;
            proxy_set_header   Host      $http_host;
            proxy_pass         http://127.0.0.1:8080;
        }

    }

}

please give me a suggestion is there any other best way to do (sorry for my english)