Nuxtjs project runs on at least 4 addresses. How to remove launch on IP?

Question

Nginx

The question-situation concerns everything a little bit, nginx, nodejs, nuxtjs and seo shmeo are involved here.
Suppose I have a domain "domain.ru" located at the ip address "ip-address" . There are no other domains on ip. I made a nuxtjs application and uploaded it to the site via git/github. Next, I configured nginx as a proxy and launched the application. By default, nuxt runs it on port 3000, but thanks to proxying, access is also available on standard ports 80. As a result, it works on four addresses:

1. domain.ru
   
2. domain.ru:3000
   
3. ip-address
   
4. ip-address:3000
   

And this is the minimum. And if there are other domains on the ip-address, on each of them, when specifying port 3000, the application also opens. In total, from 4 to the nth number of addresses where the application is available. But that's okay, let's say I have allocated a separate ip for the domain. All the same there are 4 addresses.
But I'm going to do a real project, what will it be like for the same seo? In a good way, I would leave 2 addresses - domain.ru and domain.ru:3000 . In short, I need to make sure that the ip-address has some kind of stub thread, but when you enter the domain, all the application's performance is preserved.
If anything, I don’t know anything about servers, let the phrase “configured nginx as a proxy” not be misleading, because I set it up purely by poke and googling.