We'll create fresh WordPress site with Non Cache Public Post Preview installed. You have 20 minutes to test the plugin after that site we'll be deleted.
You no longer have to use this plugin because it was merged to PPP plugin at v2.6.0.
This plugin send Cache-Control: no-cache, must-revalidate
header when show public-post-preview post.
In other word, that make skip cache of CDN (like CloudFlare, CloudFront… and other), or Proxy-Cache (Like Nginx).
So, outside people always can see newest draft, and there is no need extra time to close public draft.
This plugin needs PHP 5.3+
Note: If you’re using CloudFront, you should also use C3 Cloudfront Cache Controller