Prerender nginx.conf file for SPAs+

nginx.conf

server { 
listen 3000; 
# server_name example.com; 
root /usr/share/nginx/html; 
index index.html index.htm; 
location / { 
proxy_set_header X-Prerender-Token "YOUR PRERENDER IO TOKEN GOES HERE"; 
set $prerender 0; 
if ($http_user_agent ~* "googlebot|apis-google|mediapartners-google|adsbot|bingbot|yandex|baiduspider|twitterbot|facebookexternalhit|rogerbot|linkedinbot|embedly|quora link preview|showyoubot|outbrain|pinterest\/0\.|pinterestbot|slackbot|vkShare|W3C_Validator|whatsapp|facebot") { 
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|svg|eot)") {
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) { 
#setting prerender as a variable forces DNS resolution since nginx caches IPs and doesnt play well with load balancing 
set $prerender "service.prerender.io"; 
# rewrite .* /$scheme://$host$request_uri? break; 
rewrite .* /https://$host$request_uri? break; 
proxy_pass http://$prerender; 
} 
try_files $uri $uri/ /index.html =404; 
} 
# this alias path can be modified with the right sitemap xml path in the folder 
location /sitemap.xml { 
alias /usr/share/nginx/html/sitemap.xml;
} 
}