Nginx to server jar file(remote server)

stacks.conf

location / {
                # First attempt to serve request as file, then
                # as directory, then fall back to displaying a 404.
        #       try_files $uri $uri/ =404;
                proxy_redirect off;
                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_set_header Host $http_host;
                proxy_set_header X-Nginx-Proxy true;
                proxy_set_header Connection "";
                proxy_http_version 1.1;
                proxy_pass http://simpleserver_backend;