.htaccess: How to “Specify a cache validator”?

Question

I\'m running Google PageSpeed on my site and it\'s tell me that I need to
\"Specify a cache validator.\"

The following resources are missing a cache validator. R

Answer 1

I tested all of above codes, But see no change in gtmetrix rank. Using this improved Cache-Control (Specify a cache validator) rank for my wordpress site:

## EXPIRES CACHING ##

ExpiresActive On
ExpiresByType image/jpg "access 1 year"
ExpiresByType image/jpeg "access 1 year"
ExpiresByType image/gif "access 1 year"
ExpiresByType image/png "access 1 year"
ExpiresByType text/css "access 1 month"
ExpiresByType application/pdf "access 1 month"
ExpiresByType text/x-javascript "access 1 month"
ExpiresByType application/x-shockwave-flash "access 1 month"
ExpiresByType image/x-icon "access 1 year"
ExpiresDefault "access plus 1 year"

## EXPIRES CACHING ##


  
    Header set Cache-Control "max-age=2592000, public"
  

  
    Header set Cache-Control "max-age=2592000, public"
  

  
    Header set Cache-Control "max-age=216000, private"
  

  
    Header set Cache-Control "max-age=216000, public, must-revalidate"
  

  
    Header set Cache-Control "max-age=1, private, must-revalidate"
  

I recommend you to customize max-age values for your site and it's files yourself.