nginx.conf

worker_processes auto;
events { worker_connections 1024; }

http {
  sendfile on;

  upstream answer_service { server 127.0.0.1:9000; }
  upstream question_service { server 127.0.0.1:8000; }
  upstream ui { server 127.0.0.1:7861; }

  server {
    listen 7860;

    location /answers/ {
      proxy_pass http://answer_service/;
      proxy_set_header Host $host;
    }

    location /questions/ {
      proxy_pass http://question_service/;
      proxy_set_header Host $host;
    }

    location / {
      proxy_pass http://ui/;
      proxy_set_header Host $host;
    }
  }
}