nginx.conf

worker_processes  5;  ## Default: 1
error_log  error.log;
pid        nginx.pid;
worker_rlimit_nofile 8192;

events {
  worker_connections  4096;  ## Default: 1024
}

http {
  index    index.html index.htm index.php;

  default_type application/octet-stream;
  log_format   main '$remote_addr - $remote_user [$time_local]  $status '
    '"$request" $body_bytes_sent "$http_referer" '
    '"$http_user_agent" "$http_x_forwarded_for"';
  access_log   access.log  main;
  sendfile     on;
  tcp_nopush   on;
  server_names_hash_bucket_size 128; # this seems to be required for some vhosts
    server {
        listen 80 default_server;
        listen [::]:80 default_server;


        root /var/www/html;

        index index.html index.htm index.nginx-debian.html;

        server_name _;

        location / {
            # serve static frontend first
            try_files $uri $uri/ /index.html;
        }

        # location ~*^/(api|posts|products) {
        location /api {
            rewrite /api/(.*) /$1  break;
            proxy_pass http://nodeserver:4000;
            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;
        }
    }
}