enable websocket nginx

 server {
    listen  80;
    server_name  chat.dev.abctech-thailand.com ~.+\.chat\.dev\.abctech-thailand\.com$ ~.+\.chat\.int\.abctech-thailand\.com$ chat.abct.io;
    location / {
        proxy_pass http://meetv:8080/;
        proxy_http_version 1.1;
        proxy_redirect     off;
        proxy_set_header   X-Forwarded-For $remote_addr;
        proxy_set_header   X-Forwarded-Port 443;
        proxy_set_header   Host $host;
        proxy_set_header   Upgrade $http_upgrade;
        proxy_set_header   Connection "upgrade";
        add_header Strict-Transport-Security max-age=31536000;
        add_header X-Frame-Options DENY;
    }
    include /etc/nginx/robots.conf;
 }