How can I prevent port number from being attached to url in nginx

Question

Consider the server name www.example.com and the application should work on the port number 3000.

When I type www.example.com/user which is the proxied url for our user application received from the host team, the application does not work. It authomatically redirects from www.example.com/user to www.example.com:3000/user/

But When I type www.example.com/user/ with trailing slash at the end, the application works perfectly.

I want the application to work when typing www.example.com/user without redirecting to www.example.com:3000/user/

For that, it should not add :3000 anymore on the url and the application should work. Thank you for helping.

Here is my code:

worker_processes 1;
events {
    worker_connections 4096;
}

http {
    include mime.types;
    sendfile on;

    server {
        listen 3000 ssl;
        listen [::]:3000 ssl;

        resolver 127.0.0.11;
        autoindex off;

        server_name dthhub.umadev.dth.ihost.com;
        server_tokens off;

        ssl_certificate  /etc/nginx/d2dnode02.crt;
        ssl_certificate_key  /etc/nginx/d2dnode02.key;
        

        location /user {
            #alias /app/dist/dashboard-user;
            alias /usr/share/nginx/html;
            index index.html;
        }
        gzip_static on;
    } 

}