Nginx Prerender conf

server {
	server_name xyz.com;

	root  /home/ubuntu/www;

	large_client_header_buffers 4 16k;
	client_max_body_size 4G;
	keepalive_timeout 10;
	gzip_static on;

	location / {
                error_page 404 =200 /index.html;
                set $prerender 0;

		if ($http_user_agent ~* "googlebot|SerendeputyBot|baiduspider|twitterbot|telegrambot|whatsapp|facebookexternalhit|rogerbot|linkedinbot|embedly|showyoubot|outbrain|pinterest|slackbot|W3C_Validator|curl") {
                        set $prerender 1;
                }

                if ($args ~ "_escaped_fragment_") {
                        set $prerender 1;
                }
                if ($http_user_agent ~ "Prerender") {
                        set $prerender 0;
                }
                if ($uri ~ "\.(js|css|xml|less|png|jpg|jpeg|gif|pdf|doc|txt|ico|rss|zip|mp3|rar|exe|wmv|doc|avi|ppt|mpg|mpeg|tif|wav|mov|psd|ai|xls|mp4|m4a|swf|dat|dmg|iso|flv|m4v|torrent|ttf|woff)") {
                        set $prerender 0;
                }

            		#resolve using Google's DNS server to force DNS resolution and prevent caching of IPs
                resolver 8.8.8.8;


                if ($prerender = 1) {
                        # prerender is running locally in port 3000
                       proxy_pass http://127.0.0.1:3000/$scheme://$host${uri};
                }

        }

	if ($request_method !~ ^(GET|HEAD|PUT|PATCH|POST|DELETE|OPTIONS)$ ){
		return 405;
	}

	listen 443 ssl http2; # managed by Certbot


    ssl_certificate /path/to/cert';
    ssl_certificate_key /path/to/key';
}

server {
	if ($host = xyz.com) {
		return 301 https://$host$request_uri;
	}

	server_name xyz.com;
	listen 80;
	return 404;
}