NGINX - Reverse proxy multiple API on different ports

Question

I have the following API(s):

1. localhost:300/api/customers/
2. localhost:400/api/customers/:id/billing
3. localhost:500/api/orders

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Answer 1

The accepted answer did not work for me; I had three servers running as Kubernetes service mapped to different Cluster IP's (accessible only from Kubernetes nodes). So I used the host machine IP - 10.ttt.ttt.104 and the following configuration so that I could access these services from my work network.

I am not an nginx expert by any length- but this worked -- so use it as base maybe

events {
  worker_connections  4096;  ## Default: 1024
}
http{
    server {
       listen 80;
       listen [::]:80;

       server_name 10.ttt.ttt.104;
       proxy_set_header Host $host;
       proxy_set_header X-Forwarded-For $remote_addr;

       location / {
           proxy_pass http://10.103.152.188:80/;
       }
     }

    server {
       listen 9090;
       listen [::]:9090;

       server_name 10.ttt.ttt.104;
       proxy_set_header Host $host;
       proxy_set_header X-Forwarded-For $remote_addr;

       location / {
           proxy_pass http://10.107.115.44:9091/;
       }
     }

    server {
       listen 8080;
       listen [::]:8080;

       server_name 10.ttt.ttt.104;
       proxy_set_header Host $host;
       proxy_set_header X-Forwarded-For $remote_addr;

       location / {
           proxy_pass http://10.105.249.237:80/;
       }
     }
}