If you test your website’s performance using GTmetrix or Pingdom, you may run into an error that says to “specify a cache validator.” That message means that you’re not leveraging browser caching to its full extent. Unfortunately, this can negatively affect your site’s performance.
In this article, we’ll talk about what the “specify a cache validator” error means. We’ll also show you how to fix it in WordPress and optimize your website’s performance. Let’s get right to it!