Danila Vershinin

Cacheability makes your WordPress site a better HTTP citizen, improving SEO and cache efficiency.
<h4>Free Features</h4>
Soft 404 Fix
WordPress returns HTTP 200 for empty search results, invalid tag pages, and empty category archives. Google marks these as “soft 404” errors in Search Console, hurting your SEO.
Cacheability fixes this by returning proper 404 status codes when:
<ul>
<li>Search results are empty (<code>/?s=nonexistent</code>)</li>
<li>Tag archives are empty (<code>/tag/nonexistent/</code>)</li>
<li>Category archives are empty</li>
<li>Author archives are empty</li>
</ul>
Smart Cache-Control Headers
Automatically adds <code>s-maxage</code> headers so Varnish, NGINX, and CDNs can cache your pages efficiently without affecting browser caching behavior.
<ul>
<li>Search/404 pages: 1 hour cache</li>
<li>All other pages: 1 year cache (your purge plugin handles invalidation)</li>
</ul>
<h4>Cacheability Pro</h4>
Upgrade to <a href="https://www.getpagespeed.com/web-apps/cacheability-pro" rel="nofollow ugc">Cacheability Pro</a> for advanced features:
<ul>
<li>Cache Warming — Automatically warm pages after purging so visitors never hit cold cache</li>
<li>Conditional GET (304) — Return 304 Not Modified for unchanged content, saving bandwidth</li>
<li>ESI Support — Cache pages with dynamic nonces (comments, login forms)</li>
<li>Rate-Limit Safe — Smart request queuing to avoid 429 errors</li>
<li>Sitemap Warming — Warm all pages from sitemap after full purge</li>
<li>WP-CLI Commands — <code>wp cacheability warm</code> and more</li>
<li>Priority Support — Get help when you need it</li>
</ul>
<a href="https://www.getpagespeed.com/web-apps/cacheability-pro" rel="nofollow ugc">Get Cacheability Pro →</a>

Cacheability

HTTP optimization for WordPress. Fixes soft 404 errors and adds smart cache headers.

Dsingh

Purge Varnish Cache provides integration between your WordPress site and multiple Varnish Cache servers. Purge Varnish Cache sends a PURGE request to the URL of a page or post every time based on configured actions and trigger by site administrator. Varnish is a web application accelerator also known as a caching HTTP reverse proxy.
Features: 
* Support on all varnish versions of 3.x, 4.x, 5.x and 6.x 
* One time configuration. 
* admin-socket integration and Varnish admin interface for status. 
* unlimited number of Varnish Cache servers. 
* Custom URLs purge. 
* User interface for manual purge. 
* Single click entire cache purge. 
* Debugging. 
* Actively maintained.
Requirements: Apache sockets module/extention should be enabled.
Purpose: The main purpose of developing this plugin is to deliver updated copy of content to end user without any delay.
Enhancement Request: For any further enhancement, please mail me at <a href="mailto:dev.firoza@gmail.com" rel="nofollow ugc">dev.firoza@gmail.com</a>

Purge Varnish Cache

I try so many plugins available on wordpress.org but it have the following unique features  in respect of available other plugins on wordpress.org.


    	admin-socket integration and Varnish admin interface for status etc.

    	Unlimited number of Varnish Cache servers

    	Configurable actions upon events that will expire URLs from varnish cache like reverse proxy caches.

    	Purge multiple URLs manually from Varnish cache.

        Debugging

Purge Varnish Cache automatically based on configurable actions upon events or s

Clean clear VARNISH cache automatically when content on your site is created or modified, also allow you to purge VARNISH cache manually.

Cacheability vs Purge Varnish Cache