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Yes, you can:

• Point all the domains to the IP address of your machine, at port 80
• In your machine, setup nginx or HA Proxy to listen and map the request to relevant port.

A simple config with nginx:

server{

  listen 80;

  server_name domain1.com;

  charset utf-8;

  location / {
    proxy_pass http://127.0.0.1:3000;
  }

}

Note that, each app must have its own port. Your app2 and app3 could not run on the same port.