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

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 automatically 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;
}
}

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