webpack-dev-server configuration in nginx on development server
upstream ws_server {
  server 127.0.0.1:8080;
}
server {
    listen       80;
    server_name  10.1.2.225;
    location / {
       proxy_pass   http://ws_server/;
       proxy_redirect off;
       proxy_http_version 1.1;
       proxy_set_header Upgrade $http_upgrade;
       proxy_set_header Connection "upgrade";
    }
}