nginx.conf

upstream api_node_js {
     server 127.0.0.1:4000;
}

server {
    listen 80;
    listen [::]:80;

    root /var/www/webapp/dist;

    index index.html;

    access_log /var/log/nginx/webapp.access.log;
    error_log /var/log/nginx/webapp.error.log;

    location / {
        try_files $uri $uri/ =404;
    }

    location /auth/ {
      proxy_pass http://api_node_js;
      proxy_http_version 1.1;
      proxy_set_header Upgrade $http_upgrade;
      proxy_set_header Connection 'upgrade';
      proxy_set_header Host $host;
      proxy_cache_bypass $http_upgrade;
    }

    location /api/ {
      proxy_pass http://api_node_js;
      proxy_http_version 1.1;
      proxy_set_header Upgrade $http_upgrade;
      proxy_set_header Connection 'upgrade';
      proxy_set_header Host $host;
      proxy_cache_bypass $http_upgrade;
    }

}